1-tan2a5/1+tan2a=cos2a-sin2a

Dear Rob,

And your question is?

I did trigonometry, but unfortunately failed the mind-reading course...

Maybe this link to Dave's Short Trig Course will help you. Special attention for chapter 16 : Summary of trigonometric identities.

If not please state clearly with what I can help you...

:)

(1+cos(x))/(sin(x)) + (sin(x))/(1+cos(x))=2 csc(x)

Quote:

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Originally Posted by DollyHolly

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See here:

https://www.askmehelpdesk.com/math-s...es-324123.html