In Exercises let and g represent differentiable functions such that # 0 and g #
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In Exercises let ƒ and g represent differentiable functions such that ƒ" # 0 and g" # 0.
Prove that if ƒ and g are positive, increasing, and concave upward on the interval (a, b), then ƒg is also concave upward on (a, b).
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