$9^8\cdot9^{-5}$
$7x\:+\:4\left(7x-2\right)$
$\frac{5}{\pi}\int_0^{\pi}\left(\frac{5}{\pi}\right)x\cos\left(2x\right)dx$
$cos^{\left(2\right)}x+cot^{\left(2\right)}x\cos\:^{\left(2\right)}x=\cot\:^{\left(2\right)}x$
$log\left(x-4\right)+logx=log5$
$\int\frac{e^{2x}}{7}dx$
$\int\frac{1}{\sqrt{t^2-6t}}dx$
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