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Question

If esinxesinx4=0 then the number of real values of x is

A
0
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B
2
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C
1
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D
infinite
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Solution

The correct option is D 0
let, esinx=k
k1k4=0
k214k=0
k=2±5
esinx=k=2±5
sinx=ln(2±5)>1
so, no solutions

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