Ex 5.5, 1 - Differentiate cos x . cos 2x . cos 3x - Class 12
www.teachoo.com › 3667 › 701Ex 5.5, 1 Differentiate the functions in, cosβ‘π₯ . cosβ‘2π₯ . cosβ‘3π₯ Let y = cosβ‘π₯ . cosβ‘2π₯ . cosβ‘3π₯ Taking log both sides logβ‘π¦ = log (cosβ‘π₯.cosβ‘2π₯.cosβ‘3π₯ ) πππβ‘π = πππ β‘(πππβ‘π) + πππ β‘(πππ ππ) + πππ β‘(πππβ‘ππ) Differentiating both sides π€.π.π‘.π₯.