Question: Help The function f is defined by f (ac) - ac2 - 5x + sin (ac2 + 2) . Let / be the line tangent

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The function f is defined by f (ac) - ac2 - 5x + sin (ac2 + 2) . Let / be the line tangent to the graph of f at a = 2.5. Find all values of a in the interval -1.5, 3.5] where the line tangent to the graph of f is parallel to &, excluding x = 2.5. You may use a calculator and round to the nearest thousandth

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