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Evaluate the integral \(\int^{\frac{\pi}{4}}_{\frac{\pi}{12}...

Evaluate the integral π4π122cos2xdx

A.

-12

B.

-1

C.

12

D.

1

Correct answer is C

π4π122cos2xdx

= [2sin2x2]|π4π12

= sin2x|π4π12

= sin2(π4)sin2(π12)

= sinπ2sinπ6

= 112=12