Question: a = - V19 and b = = J19 xample 3.31. Prove that: T sin (x + y) sin (x - y) = sin2x

a = - V19 and b = = J19 xample 3.31. Prove

a = - V19 and b = = J19 xample 3.31. Prove that: T sin (x + y) sin (x - y) = sin2x sin2y = cosy - cos-x = CoS

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