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If $\int e^x(1+x). \sec^2(xe^x)dx-f(x)+constant$ then $f(x)=$

\[\begin {array} {1 1} (1)\;\cos (x e^x) & \quad (2)\;\sin (x e^x) \\ (3)\;2 \tan ^{-1} (x) & \quad (4)\;\tan (x e^x) \end {array}\]
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1 Answer

$(4)\;\tan (x e^x) $
answered Nov 7, 2013 by pady_1
 
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