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teachoo.com
Ex 3.3, 21 - Prove cos 4x cos 3x cos 2x / sin 4x
Ex 3.3, 21Prove that (cos4𝑥 cos3𝑥 cos2𝑥)/(sin4𝑥 sin3𝑥 sin2𝑥 ) = cot 3xSolving L.H.SSolving Numerator and Denominator separatelyWe know that cos x cos y = 2cos ((𝑥 𝑦)/2) cos ((𝑥 −𝑦)/2)Replacing x by 4x and y by 2x cos 4x cos 2x = 2cos ((4𝑥 2𝑥)/2). cos ((4𝑥
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