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Mathematics, 06.10.2019 09:01 smilebehappy468

The derivative of a function f is given by f'(x) = x^3 - 4 sin(x^20 + 1. on the interval (-2.5, 2.5), at which of the following values of x dos f have a relative maximum?
a. -1.970 and 0
b. -1.467 and 1.075
c. -0.475, 0.542, and 1.396
d. -0.475 and 1.396 only
e. 0.542 only

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