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Question

The set of positive real values of the parameter 'a' for which the equation |sin2x|-|x|-a=0 does not have any real solution is


A

(33+π6,)

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B

(33π6,)

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C

(33π12,)

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D

(33+π12,)

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Solution

The correct option is B

(33π6,)


Let us first consider the case when y=|sin2x|, y=|x|+a touch each other.



If P is the point of contact, then at point P,
we have 1= 2cos2x (i.e slopes are equal)
cos2x=12x=π6P=(π6,32)
Now P lies on y=x+a
32=π6+aa=33π6
For not to touch a(33π6,)


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