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[solved] - I find this ugly...

Source: flanders '88

August 9, 2004
calculusderivativegeometrytrigonometryfunctioninequalitiesquadratics

Problem Statement

Be RR a positive real number. If R,1,R+12R, 1, R+\frac12 are triangle sides, call θ\theta the angle between RR and R+12R+\frac12 (in rad). Prove 2Rθ2R\theta is between 11 and π\pi.
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