1 dx =- + b tan f(x)+c, tan-1 (sin x+ 4)(sin x-1) then 2 4 tan x +3 (a) ab=-e/)= 15 4 tan +1 1 2 (b) a--b=--sx) =. vis 4 tan x+1 (c) a= ,b = - 5 4 tan +1 2 (d)

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