Question: (a) Write by Eulers formula, expand, and equate real and imaginary parts to derive the identities (b) Use the result of part (a) to find

(a) Write

cos 3x + i sin 3x = e3ix = (cos x +

by Euler’s formula, expand, and equate real and imaginary parts to derive the identities

i sin x)

(b) Use the result of part (a) to find a general solution of

cos 3x + i sin 3x = e3ix = (cos x + i sin x)

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