If frac{3+isintheta}{4-icostheta}, theta...

If `frac{3+isintheta}{4-icostheta}, theta in [0,2pi]`, is a real number, then an argument of `sintheta+icostheta` is

A

`A.pi-tan^-1(frac{3}{4})`

B

`B.pi- tan^-1(frac{4}{3})`

C

`C.tan^-1(frac{4}{3})`

D

`D.-tan^-1(frac{3}{4})`

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