derive identity help

**jvignacio** · November 20th 2008, 08:48 PM

$<br /> \frac{\cos\theta\tan\theta + \sin\theta}{\tan\theta} = 2\cos\theta<br />$

help deriving this identity. thank you

**Chris L T521** · November 20th 2008, 08:51 PM

Originally Posted by jvignacio

$<br /> \frac{\cos\theta\tan\theta + \sin\theta}{\tan\theta} = 2\cos\theta<br />$

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

**jvignacio** · November 20th 2008, 10:08 PM

Originally Posted by Chris L T521

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

**Krizalid** · November 21st 2008, 09:54 AM

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

**Math_Helper** · November 21st 2008, 10:06 AM

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