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In the interval ((pi)/(4), (11 pi)/(12))...

In the interval `((pi)/(4), (11 pi)/(12))`, then function `f (x) = sin 3x - cos 3x, 0 lt x lt pi` is:

A

strictly increasing

B

strictly decreasing

C

both increasing and decreasing

D

neither increasing nor decreasing

Text Solution

Verified by Experts

The correct Answer is:
D
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