Trigonometric EquationHard

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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