What are the steps you need to do to verify a trigonometric identity? I'm not sure how to do it.
1 - 2cos^2x = 2sin^2x - 1

Question

What are the steps you need to do to verify a trigonometric identity? I'm not sure how to do it.
1 - 2cos^2x = 2sin^2x - 1

sharpsage · Answer

$$1-2\cos^2x=2\sin^2x-1$$

australopithecus · Answer

You just want to show that one side is equal to the other side, so pick a side then apply trig identities until it looks the same as the side you did not touch

jdoe0001 · Answer

hmmm if you were to solve say $\bf sin^2(\theta)+cos^2(\theta)=1$   for $cos^2(\theta)$    what would you end up with?

triciaal · Answer

one approach 
use identities you know to express terms differently on one side then simplify until the result is the same as the other side 


using sin^2 + cos ^2 = 1 
working with the left hand side   LHS

triciaal · Answer

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