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Integration by susbtitution, no hint given

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Evaluate the following indefinite integrals using integration by substitution. Use the letter C to represent any unknown constants.

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$\\int e^x\\sqrt{1+e^x}\\mathrm{dx}$

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$\\int\\frac{\\mathrm{dx}}{\\var{a}x+\\var{b}}$.

\n

Answer in terms of the natural log, represented by ln( ).

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$\\int \\frac{x \\mathrm{dx}}{\\var{c}+x^2}$.

\n

Answer in terms of the natural log, represented by ln( ).

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integration by Susbtitution

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