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November 01, 2025, 07:50:27 pm
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Author Topic: Trig proof...  (Read 802 times)  Share 

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BlueYoHo

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Trig proof...
« on: March 09, 2009, 02:15:06 pm »
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I don't understand how
I know
And I'm assuming that because it's instead of that it is negative
But since it's and shouldn't it equal something like ?



Can someone please go through the steps...Thanks in advance :)
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kurrymuncher

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Re: Trig proof...
« Reply #1 on: March 09, 2009, 02:21:38 pm »
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hint: use the difference of two squares rule.

You should end up with: (sinx^2 +cosx^2)( sinx^2-cosx^2)

Because (sinx^2 +cosx^2)=1, that means the answer is actually ( sinx^2-cosx^2), which is Cos2x multiplied by -1

sorry cbf using latex
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BlueYoHo

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Re: Trig proof...
« Reply #2 on: March 09, 2009, 02:29:36 pm »
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OOOOOOOOOOOOOOOOOOOOHHHHHHHHHHHHHHHHHHHHHH now I get it.

Lol, thanks heaps man.
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