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04-24-2018, 02:57 PM | #1 |
Rose Trellis
My sweet boy a few days after his 1st birthday!
Join Date: Mar 2011
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Are there any super smart math people here?
I'm struggling with my pre-calculus homework and could really use some help if anyone has time or could possibly help me!
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Krista
Wife to M since 5/09 Mama to E since 8/10 Baby C born 12/19/18! |
04-24-2018, 02:59 PM | #2 |
Administrator
"air-mannah Leen-dah" it means Sister Linda in Spanish
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Re: Are there any super smart math people here?
I'm not super smart, but I used to tutor algebra.
Sent from my Moto E (4) using Tapatalk
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04-24-2018, 03:01 PM | #3 | |
Rose Trellis
My sweet boy a few days after his 1st birthday!
Join Date: Mar 2011
Location: Georgia
Posts: 3,319
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Re: Are there any super smart math people here?
Quote:
I attached a picture of the problem I'm working on. If you can help I would greatly appreciate it Sent from my XT1710-02 using Tapatalk
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Krista
Wife to M since 5/09 Mama to E since 8/10 Baby C born 12/19/18! |
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The Following User Says Thank You to Atsirk For This Useful Post: | Hermana Linda (04-24-2018) |
04-24-2018, 03:12 PM | #4 |
Administrator
"air-mannah Leen-dah" it means Sister Linda in Spanish
Join Date: Mar 2005
Posts: 51,861
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Re: Are there any super smart math people here?
Where did line 2 come from?
I tutored algebra, not calculus. I don't really remember much of calculus. Sent from my Moto E (4) using Tapatalk
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My pages: Why Not Train A Child? and the FB Page as well as @WhyNotTrain on Twitter Read about how my husband was Pulled From The River By God |
04-24-2018, 03:22 PM | #5 |
Rose Trellis
My sweet boy a few days after his 1st birthday!
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Location: Georgia
Posts: 3,319
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Re: Are there any super smart math people here?
I just expanded cos(a+b)
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Krista
Wife to M since 5/09 Mama to E since 8/10 Baby C born 12/19/18! |
04-24-2018, 03:32 PM | #6 |
Administrator
"air-mannah Leen-dah" it means Sister Linda in Spanish
Join Date: Mar 2005
Posts: 51,861
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Re: Are there any super smart math people here?
I guess I don't remember anything about cos. I would have put cos(a+b)= cos a + cos b.
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My pages: Why Not Train A Child? and the FB Page as well as @WhyNotTrain on Twitter Read about how my husband was Pulled From The River By God Last edited by Hermana Linda; 04-24-2018 at 09:34 PM. |
04-24-2018, 04:36 PM | #7 |
Rose Garden
Join Date: Jun 2005
Posts: 27,359
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Re: Are there any super smart math people here?
I think it can be simplified to cosa/sina-sinb/cosb and then further to tangent of a - (1/tangent)b. I think it might be zero because the tangent of a is the same as 1/tangent of b. Please let us know- now I want to know if I'm remembering that right.
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04-24-2018, 04:36 PM | #8 |
Rose Trellis
Join Date: Oct 2011
Posts: 2,871
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Re: Are there any super smart math people here?
Did you finish it yet? I love trigonometry.
Is the idea to simplify the left side of the equation? |
The Following User Says Thank You to derdsgirl For This Useful Post: | Hermana Linda (04-24-2018) |
04-24-2018, 04:46 PM | #9 | |
Rose Trellis
My sweet boy a few days after his 1st birthday!
Join Date: Mar 2011
Location: Georgia
Posts: 3,319
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Re: Are there any super smart math people here?
Quote:
Sent from my XT1710-02 using Tapatalk
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Krista
Wife to M since 5/09 Mama to E since 8/10 Baby C born 12/19/18! |
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04-24-2018, 05:13 PM | #10 |
Rose Trellis
Join Date: Oct 2011
Posts: 2,871
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Re: Are there any super smart math people here?
So I know the goal, sine squared plus cosine squared. Every trigonometric identity comes from that one. I had to prove it when I took trigonometry. Since the right side is 1, we know the left is going to be some form of sine squared plus cosine squared. Let me see if I can work it out on paper a bit.
---------- Post added at 05:13 PM ---------- Previous post was at 04:56 PM ---------- Ok, so I got it to cosA/cosB=1 or cosA=cosB, but that doesn't make too much sense yet. |
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04-24-2018, 06:56 PM | #11 |
Rose Trellis
My sweet boy a few days after his 1st birthday!
Join Date: Mar 2011
Location: Georgia
Posts: 3,319
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Re: Are there any super smart math people here?
All the rest of the problems I was able to find online. It makes me wonder if he typed it wrong on the worksheet.
Sent from my XT1710-02 using Tapatalk
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Krista
Wife to M since 5/09 Mama to E since 8/10 Baby C born 12/19/18! |
The Following User Says Thank You to Atsirk For This Useful Post: | ECingMama (04-24-2018) |
04-24-2018, 08:14 PM | #12 |
Rose Garden
Join Date: Aug 2009
Posts: 16,750
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Re: Are there any super smart math people here?
flashbacks!!!!!!!!!!!!!!!
I'm running for my life! Come back with the answer, okay?!
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04-24-2018, 09:21 PM | #13 |
Climbing Rose
Now I'm standing here, my heart so full I can't explain.
Join Date: Oct 2010
Location: Sydney Australia
Posts: 1,352
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Re: Are there any super smart math people here?
I watched khan academy A LOT during my studies. Which had only an element of math.
Maybe there is something there you could watch?
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Finally after 5 years, I am a Mama to a gorgeous boy. DS Sweet Pea February 2010 TTC a second child since 2011 Giving up, with peace granted by God. (Trying IVF one more time - I got an inheritance ) It worked!!! But then failed ~ ~ Be the kind of woman that when your feet hit the floor each morning the devil says "Oh Crap, She's up!" ~
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04-24-2018, 09:45 PM | #14 |
Rose Trellis
Formerly kdhfly
Join Date: Jul 2011
Posts: 1,760
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Re: Are there any super smart math people here?
I agree that the left hand side simplifies to cos(a)/cos(b), but that is obviously not equal to one for all a and b. I think you are right that there is likely a copy error somewhere.
ETA: One can see that it is almost elegant because cos(a+b) is cos(a)cos(b) - sin(a)sin(b). So the second term and the third term cancel each other out in the original expression. But you are left with cos(a)/cos(b)=1.
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DH and four along for our crazy ride The greater the difficulty the greater the glory - Cicero Last edited by OnAMission; 04-24-2018 at 09:48 PM. |
04-27-2018, 07:23 AM | #15 |
Rose Trellis
My sweet boy a few days after his 1st birthday!
Join Date: Mar 2011
Location: Georgia
Posts: 3,319
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Re: Are there any super smart math people here?
So I got my paper back and I got all of the points so I'm posting it in case anyone wants to see it still doesn't really make sense to me but oh well.
Also I found out that I don't have to take the final exam because my grade is already an A!! Sent from my XT1710-02 using Tapatalk
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Krista
Wife to M since 5/09 Mama to E since 8/10 Baby C born 12/19/18! |
The Following 7 Users Say Thank You to Atsirk For This Useful Post: | Aerynne (04-27-2018), ECingMama (04-27-2018), Hermana Linda (04-27-2018), knitlove (04-27-2018), OnAMission (04-27-2018), Singingmom (04-27-2018), squiddles (04-27-2018) |
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