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Math2org Math Tables Integral ln (x) Discussion of ln (x) dx = x ln (x) x C 1 Proof Strategy Use Integration by Parts ln (x) dx set u = ln (x), dv = dxShop the latest women's fashion at PrettyLittleThing Hit refresh on your wardrobe and discover thousands of this season's musthave looks and trends online at PLTSolve the integral = ln u C substitute back u=cos x = ln cos x C QED 2 Alternate Form of Result tan x dx = ln cos x C = ln (cos x)1 C = ln sec x C Certification Of Ux Training Achievement With Nielsen Norman Group 4.97817081e-19 m kg / s