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Show that the function given by f f" "(x...

Show that the function given by f `f" "(x)" "=" "3x" "+" "17(x)" "=" "s in" "x` is (a) strictly increasing in `(0,pi/2)` (b) strictly decreasing in `(pi/2,pi)` (c) neither increasing nor decreasing in `(0," "pi)`

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