Determine the value of x when the slope is its maximum for the function f(x) = 2cos (3x)

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Q: i can't understand your solution

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A: Solution :fx=ax3+bx2+cx+d f0=2  givend=2   ... 1critical number :f'x=0f'x=3ax2+2bx+c3ax2+2bx+c=0c=0…

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A: We can find the answer as below

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A: Here, to find the parametric equation of the paraboloid x2+4y2-z=0 and the plane 2x-z=0