2. Consider the function f : R - R defined by f(x) = x - cos(x). (a) Determine the intervals where f is concave up
2. Consider the function f : R - R defined by f(x) = x - cos(x). (a) Determine the intervals where f is concave up and concave down respectively. Make sure to indicate intervals of positive and negative sign for f"(x) on a number line.
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