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#1

$Old$ November 20th, 2008, 10:48 PM

jvignacio $jvignacio is offline$

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$Default$ derive identity help

$\frac{\cos\theta\tan\theta + \sin\theta}{\tan\theta} = 2\cos\theta$

help deriving this identity. thank you

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#2

$Old$ November 20th, 2008, 10:51 PM

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Originally Posted by jvignacio $View Post$

$\frac{\cos\theta\tan\theta + \sin\theta}{\tan\theta} = 2\cos\theta$

help deriving this identity. thank you

Note that $\cos\vartheta\tan\vartheta=\sin\vartheta$ and $\tan\vartheta=\frac{\sin\vartheta}{\cos\vartheta}$

Can you try and see if you can establish this identity?

--Chris

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#3

$Old$ November 21st, 2008, 12:08 AM

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Note that $\cos\vartheta\tan\vartheta=\sin\vartheta$ and $\tan\vartheta=\frac{\sin\vartheta}{\cos\vartheta}$

Can you try and see if you can establish this identity?

--Chris

no im not very familiar with identities

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#4

$Old$ November 21st, 2008, 11:54 AM

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Those are basic ones, better you review some of trig.

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$Old$ November 21st, 2008, 12:06 PM

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