Find the intervals in which the function `f(x)=3x^4-4x^3-12 x^2+5` is (a) strictly increasing (b) strictly decreasing

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Correct Answer - (a) Strictly increasing in `[-1, 0] uu [2, oo]`
(b) Strictly decreasing in `[-oo, -1] uu [0, 2]`

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