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15 Let z = cose + i sine. Then the value of Im(z2m-) at 0= 2 is (A) (C) 1 sin 2 1 2

15 Let z = cose + i sine. Then the value of Im(z2m-) at 0= 2 is (A) (C) 1 sin 2 1 2 sin 2 m=1 (B) (D) 1 3sin 2 1 4 sin 2

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