Find the intervals in which the function f given by 4sin 2 cos( ) 2 cos

x x x xf x x

− −= + is (i) increasing (ii) decreasing.

Question

Find the intervals in which the function f given by 4sin 2 cos( ) 2 cos
| x x x xf | x | x |
|---|---|---|
− −= + is (i) increasing (ii) decreasing.

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Question 3