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The real part of (1-costheta + 2isinthet...

The real part of `(1-costheta + 2isintheta)^-1 is

A

`frac{1}{5costheta}`

B

`frac{1}{5-costheta}`

C

`frac{1}{3-5costheta}`

D

`frac{1}{5+3costheta}`

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