\(\int\limits_1^2 {a{}^xdx} \) equals:

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1 + 0 =
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\(\int\limits_1^2 {a{}^xdx} \) equals:

\(\frac{{{a^2}}}{{\ln a}} - \frac{a}{{\ln a}}\)

\(\frac{{{a^2}}}{{{{(\ln a)}^2}}}\)

\(\frac{{{a^2}}}{{\ln a}}\)

\(\frac{a}{{{{(\ln a)}^2}}}\)