Show that sin u i cos u. Assume that u Z 2pk, where k is an integer. Hint: Work with the
Chapter 13, Problem 79(choose chapter or problem)
Show that sin u i cos u. Assume that u Z 2pk, where k is an integer. Hint: Work with the left-hand side; first rationalize the denominator by multiplying by the quantity 811 sin u2 i cos u11 sin u2 i cos u3
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