Question 225038
How to verify this equation 
cos^2x*sin^2x=1-2sin^2x
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{{{cos^2(30)*sin^2(30) = 1 - 2sin^2(30)}}}
(3/4)*(1/4) =? 1 - 2(1/4)
3/16 =? 1/2
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That's not a good equation.  One case not equal is sufficient.