Posted by Christina on Thursday, December 2, 2010 at 10:11pm.
I've tried many times to get the equation to balance using trig identities like halfangle formulas, powerreducing formulas, and double angle formulas, but I couldn't get the equation to equal out. I only need to work one side to make it equal to the other, like a kind of proof. Please help!
1  4sin^2(x)cos^2(x) = cos^2(2x)

Precalculus  MathMate, Thursday, December 2, 2010 at 11:09pm
Can you check your book to see if the given expression is "supposed" to be an identity, or is it a question to solve for x?
The left hand side:
4sin²(x)cos²(x)
=(2sin(x)cos(x))²
=sin²(2x)
Which is not an identity with the right hand side.
If it is an equation, try to solve for x. It would be an excellent exercise.
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