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Question

The value of x for which cos1(cos4)>3x24x is



Your Answer
A


Your Answer
B


Your Answer
C

(-2, 2)

Correct Answer
D



Solution

The correct option is C



cos1(cos4)=2π4
π4>3x24x
3x24x2π4<0
26π83<x<2+6π83
 

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