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Questions  

 Number of solutions of the equation cos2x+3+12sinx=34+1 in the interval [-π,π]is

a
2
b
4
c
6
d
8

detailed solution

Correct option is B

Given that cos2x+3+12sinx=34+1⇒1−sin2x+3+12sinx−34−1=0⇒sin2x−3+12sinx+34=0∴on solving, we get sinx=12,32∴ x∈−π,π  are  π6,5π6,π3,2π3 Number of solutions are 4

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