Question: please solve this question I need your help! its okay take time! Please explain in detail as well and make sure the answer is right!

please solve this question I need your help! its okay take time! Please explain in detail as well and make sure the answer is right!

7. Find the intervals of increasingidecreasing for the function f (x) = 3539):. (3 marks) 8. Find the minimum value(s) of the function f(x) =9); '235. (2 marks) 9. Determine the maximum/minimum point(s) for y = sin 2x-COSX-4x on the interval 0
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