cos 9x - cos 5x sin 17x - sin 3x -=...
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cos 9x - cos 5x sin 17x - sin 3x -=- sin 2x cos 10x

JEE/Engineering Exams
Maths
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( Rightarrow frac{cos 9 x-cos 5 x}{sin 17 x-sin 3 x}=frac{sin 2 x}{cos 10 x} ) LHSt. We know ldenth'ty Licos ( A-cos B=-2 sin left(frac{a+b}{2}right) sin left(frac{a-b}{2}right) ) ii, ( sin A-sin B=2 cos left(frac{a+b}{2}right) sin left(frac{a-b}{2}right) ) ( therefore quad angle H S H frac{-2 sin T x times sin 2 x}{2 cos 10 x sin 1 x} geqslant frac{sin 2 x}{cos 10 x} ) Pro
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