The function ff is defined by f, of, x, equals, x, cubed, minus, 4, x, minus, 4, sine, left parenthesis, 2, x, right parenthesis, .f(x)=x
3
−4x−4sin(2x). Let ellℓ be the line tangent to the graph of ff at x, equals, 1, point, 5, .x=1.5. Find all values of xx in the interval open square bracket, minus, 2, point, 5, comma, 2, close square bracket[−2.5,2] where the line tangent to the graph of ff is parallel to ell, commaℓ, excluding x, equals, 1, point, 5, .x=1.5. You may use a calculator and round to the nearest thousandth.
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