Hello, kingkaisai2!

Exactlywhereis your difficulty?

. . You don't know the binomial theorem?

. . You can't handle ?

. . You just want to check your answer?

. . (It would be considerate to show us your answer.)

If , where a and b are real, use the binomial theorem

to find the real and imaginary parts of and

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. . . . . . . . . . . . . .R . . . . . . . . . . . . . I

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. . . . . . . . . . . . . .R . . . . . . . . . . . . . I