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0 votes
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in Trigonometry by (25.4k points)
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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