For 2831, use Eulers formula to derive the identity. (Note that if a, b, c, d are real
Chapter 8, Problem 8.6.30(choose chapter or problem)
For 2831, use Eulers formula to derive the identity. (Note that if a, b, c, d are real numbers, a + bi = c + di means that a = c and b = d.)cos() = cos
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