Toets

Bereken:

\eqalign{   & a.\,\,\,\int {\frac{{{e^{\frac{1}{x}}}}}{{{x^2}}}} \,dx  \cr   & b.\,\,\,\int {\frac{1}{{x\left( {1 + {{\ln }^2}x} \right)}}\,dx}   \cr   & c.\,\,\,\int {\frac{1}{{x \cdot \ln \left( {\sqrt x } \right)}}} \,dx  \cr   & d.\,\,\,\int {\frac{{\sqrt x }}{{1 + \sqrt x }}} \,dx \cr}

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