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Questions  

The values of b such that the equation bcosx2cos2x1=b+sinxcos2x3sin2xtanx possess solutions, belong to the set

a
−∞,12
b
−∞,−12
c
−∞,∞
d
−∞,12∪1,∞

detailed solution

Correct option is D

Let us find domain of given equation Also   2cos2x−1=2cos2x−sin2x−cos2x+sin2x=cos2x−3sin2xNow given equation reduces to bsinx=b+sinx  ⇒sinx=bb−1 since −1≤sinx≤1,⇒-1≤bb-1≤1 ⇒b<12 or b>1 ⇒b∈-∞,12∪1,∞

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