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Problem 5. Let f(x) = lal (a) Use the formula for convexity to show f (r) is convex. (b) What is another, simpler way to

Problem 5. Let f(x) = lal (a) Use the formula for convexity to show f (r) is convex. (b) What is another, simpler way to show f (r) is convex? (c) Show that f(x) is not strictly convex

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