Trigonometric EquationMedium

Question

is -

Options

A.-l n(1 + cot^-98x) + C

B.l n(1 + cot x) + C

C.l n(1 + cot^-98x) + C

D.l n(1 + cot⁹⁸x) + C

Solution

Let 1 + cotx^-98 = t
⇒ 98 cotx^-99 cosec²xdx = dt
ln(1 + cot x^-98) + c

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