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cos = sin (pi/2-theta)
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Establishing an identity means proving that it is a true statement for all values of the variable. Your numbered statements threw me off. I thought you were asking how to prove three statements.1. Establish the identity sin(3pi/2-theta) = - cos theta
2. cos = sin (pi/2-theta)
3. sin (3pi/2-theta = - sin (pi/2-theta)