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For -pi/2 lt theta lt pi/2, (sintheta + ...

For `-pi/2 lt theta lt pi/2, (sintheta + sin 2theta)/(1+costheta + cos2theta)` lies in the interval

A

`(-infty, infty)`

B

`(-2,-2)`

C

`(0,infty)`

D

`(-1,1)`

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The correct Answer is:
A
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