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Questions  

The equation 2cos2x2sin2x=x2+1x2,0xπ2has

a
one real solution
b
no solution
c
more than one real solution
d
two solutions

detailed solution

Correct option is B

Since x2+x−2≥2     and     2cos2x2sin2x≤2⇒2cos2x2sin2x=2 ⇒cos2x2sin2x=1 ⇒cosx2=sinx=1  which is not possible for any choice of x.

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