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Find the intervals in which the following function  f(x)=20−9x+6x2−x3𝑓𝑥=20−9𝑥+6𝑥2−𝑥3 is(a)𝑎 Strictly increasing,(b)𝑏 Strictly decreasing.

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Solution 1

To find the intervals where the function is strictly increasing or decreasing, we first need to find its derivative. The derivative of a function gives us the slope of the function at any point, and the sign of the derivative tells us whether the function is increasing or decreasing.

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