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13x 13x Let z1 = 9 cos +i sin 7 7 and 27 = 3 cos + I sin 14 14 Find the following. Write your answers in trigonometric form. Give exact values in your answers (not decimal approximations). (a) 5 4 - ( cos() + 1 sin ()) JT X ? (b) -= ( cos ( ) + / sin ( ))