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| Math Central | Quandaries & Queries |
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Question from Joe, a student: I really need help with this question and I would really appreciate if you could take a minute and look at it. Prove this Trig. Identity : ((cos2θ + sinθ-1) / tanθ ) + sin2θ = cosθ Thank you |
Hi Joe,
I would first multiply both sides of
\[\frac{\cos 2\theta + \sin \theta -1}{\tan \theta} + \sin 2 \theta = \cos \theta\]
by $\tan \theta.$ Next write $\cos 2 \theta, \sin 2 \theta \mbox{ and } \tan \theta$ in terms of $\sin \theta$ and $\cos \theta$ and then simplify.
I hope this helps,
Penny
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