Solve: [log(cos x)]2

1.	Solve: [log(cos x)]2
Answer» Let y = [log(cos x)]² \(\frac{dy}{dx}\) = 2log(cos x). \(\frac{1}{cosx}\)(-sin x) = -2 tan x log(cos x)

Answer»

Let y = [log(cos x)]²

\(\frac{dy}{dx}\) = 2log(cos x). \(\frac{1}{cosx}\)(-sin x)

= -2 tan x log(cos x)

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