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prove-that-tanx-lt-4x-pi-for-0-lt-x-lt-pi-4-

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Question Number 7962 by upendrakishor99@gmail.com last updated on 25/Sep/16
prove that tanx<((4x)/π) for 0<x<(π/4)
$${prove}\:{that}\:\:\:{tanx}<\frac{\mathrm{4}{x}}{\pi}\:{for}\:\mathrm{0}<{x}<\frac{\pi}{\mathrm{4}} \\ $$

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