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For -(pi)/(2)lttheta(pi)/(2),(sintheta+s...

For `-(pi)/(2)lttheta(pi)/(2),(sintheta+sin2theta)/(1+costheta+cos2theta)` lies in the interval

A

`(-oo,oo)`

B

`(-2,2)`

C

`(0,oo)`

D

`(-1,1)`

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The correct Answer is:
A
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