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




Question Number 7962 by upendrakishor99@gmail.com last updated on 25/Sep/16
prove that   tanx<((4x)/π) for 0<x<(π/4)
provethattanx<4xπfor0<x<π4

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