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Question

The number of solutions of the equation sinπ2(1x)+cosπ2(1x)=loge|x|3+1 x>0 is

A
1
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B
2
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C
4
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D
6
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Solution

The correct option is A 1
Given sinπ2(1x)+cosπ2(1x)=loge|x|3+1
Squaring both sides

(sinπ2(1x))2+(cosπ2(1x))2+2sinπ2(1x)cosπ2(1x)=loge|x|3+1
sin(2×π(1x)2)=loge|x|3

sin(ππx)=loge|x|3
sinπx=loge|x|3

Now, drawing the graphs for both functions, we get:



For x>0, we have only one solution for the equation.

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