# trigonometric identity

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• May 3rd 2009, 05:29 PM
i_cow044
trigonometric identity
Hello, i was wondering if anyone could help me with this identity. cosθ + sinθtanθ = 1/cosθ. I've only started learning these and i'm already stuck on this one. I cannot figure it out, could someone show me the solution perhaps, or a nudge in the right direction, thank you.
• May 3rd 2009, 05:35 PM
TheEmptySet
Quote:

Originally Posted by i_cow044
Hello, i was wondering if anyone could help me with this identity. cosθ + sinθtanθ = 1/cosθ. I've only started learning these and i'm already stuck on this one. I cannot figure it out, could someone show me the solution perhaps, or a nudge in the right direction, thank you.

Hint: write $\tan(\theta)=\frac{\sin(\theta)}{\cos(\theta)}$ and get a common denominator on the left hand side.
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