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Find the derivative. 34) s= t cos t-9t sin t - 9 cos t Solve the problem. 35) Suppose that the dollar cost of

Find the derivative. 34) s -3 cos t 9t sin t - 9 cos t Solve the problem 35) Suppose that the dollar cost of producing x radi

Find the derivative. 34) s= t cos t-9t sin t - 9 cos t Solve the problem. 35) Suppose that the dollar cost of producing x radios is c(x) = 800 + 40x -0.2x. Find the marginal cost when 45 radios are produced.

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