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If the real part of the complex number (...

If the real part of the complex number `(1 - cos theta + 2 i sin theta) ^(-1) is (1)/(5) ` for ` theta in (0, pi),` then the value of the integral `int _(0) ^(theta)` sin xdx is equal to :

A

1

B

0

C

`-1`

D

2

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