Use Eqs. (8.13) and (8.14) to prove the following identities for real variables. a. sin 2 u

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Use Eqs. (8.13) and (8.14) to prove the following identities for real variables.sin x = 1 21 1 COS X=- 2 (eix - e-ix) eix + eix) (eix (8.13) (8.14)

a. sin2 u = 1/2(1 − cos(2u))

b. cos u cos v = 1/2(cos(u + v) + cos(u − v))

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