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Logarithmic Differentiation – Solved Example (2)

Take natural logarithm on both sides and simplify by the help of logarithm laws:
Differentiate both sides of the equation completely:
Applying chain rule, substitute u = f(x), v = sin x + 1, w = cos x – 1 and s = sin x – 1,
Cross multiply f(x) from left hand side denominator to the right hand side of the equation and substitute the original expression for f(x):

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