Question: Let f(r) = 2r + cos r. Mathematically explain why f(r) is increasing for all a. %3D Note: graphing the function and saying look

Let f(r) = 2r + cos r. Mathematically explain why f(r) is

Let f(r) = 2r + cos r. Mathematically explain why f(r) is increasing for all a. %3D Note: graphing the function and saying "look at it" receives a mark of zero.

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