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I need help with 39 (the answer is (2n+1) pi(+-) 1/3pi, n is an integer) but when I do the problem I don't get that

I need help with 39 (the answer is (2n+1) pi(+-) 1/3pi, n is an integer) but when I do the problem I don't get that answer so please show steps

39-40 For what values of x does the graph of f have a horizon- tal tangent? 39. f(x) = x + 2 sin x 40. f(x) = e*cos x

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