Question: May I know why I got wrong answer? and what the actual answer is? 6Tu: Problem 18 Previous Problem Problem List Next Problem (1 point)

May I know why I got wrong answer? and what the actual answer is?

6Tu: Problem 18 Previous Problem Problem List Next Problem (1 point) Let f(x) =-5x cos(x) f' (x) = 40x^7sin (x)
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