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Find intervals in which the function giv...

Find intervals in which the function given by `f(x)=(3)/(10)x^(4)-(4)/(5)x^(3)-3x^(2)+(36)/(5)x+11` is (a) Increasing (b) Decreasing.

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The correct Answer is:
(a) Function f strickly increases in `(3,oo)` and `(-2,1)`.
(b) Function f strickly decreases in (1, 3) and `(-oo,-2)`.
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