Question: Why is this not an identity? sin(2pi/3 - 3pi/4) = sin 2pi/3 - sin 3pi/4 Find the exact value of cos(alpha + beta) given that

Why is this not an identity? sin(2pi/3 - 3pi/4) = sin 2pi/3 - sin 3pi/4 Find the exact value of cos(alpha + beta) given that sin alpha = 3/4 and cos beta = -5/13 where both alpha and beta are in quadrant II.

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