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Find intervals in which the function giv...

Find intervals in which the function given by `f(x)=3/10x^(4)-4/5x^(3)-3x^(2)+36/5x+11` is
strictly decreasing

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The correct Answer is:
`(-infty, -2) cup (1, 3)`
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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 decreasing.

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