(b) On paper, use definite integration to find a formula g(k) (in terms of k) for the area under the graph of f(x) = 1 + sin(kx) on the interval 0 ≤ x ≤ 1. (Hint: the integration is with respect to x, so k is treated as a constant.) (c) This is now an optimization problem from Calculus 1; we wish to maximize the value of g(k) when k > 0. On your paper, find the derivative d/dk g(k), and then use Desmos to find the first 3 positive critical numbers of g (rounded to 3 decimal places where necessary). Evaluate g at each of these critical numbers. Write down the critical numbers and the g values on your paper, clearly labeled

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(b) On paper, use definite integration to find a formula g(k) (in terms of k) for the area under the graph of f(x) = 1 + sin(kx) on the interval 0 ≤ x ≤ 1. (Hint: the integration is with respect to x, so k is treated as a constant.)
(c) This is now an optimization problem from Calculus 1; we wish to maximize the value of g(k) when k > 0. On your paper, find the derivative d/dk g(k), and then use Desmos to find the first 3 positive critical numbers of g (rounded to 3 decimal places where necessary). Evaluate g at each of these critical numbers. Write down the critical numbers and the g values on your paper, clearly labeled

I understand part b but part c i am stuck on 

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