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

For `-pi/2 lt theta lt pi/2` ,`(sin theta + sin 2 theta)/(1+cos theta + cos 2 theta)` 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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