$9x^2-63$
$ln\:xyz^2$
$\int\frac{7}{x^{5}}dx$
$\int\frac{4}{25+4x^2}dx$
$\int\sqrt{1+r^2}dr$
$\tan\left(x\right)\sec^4\left(x\right)$
$\frac{\cot\left(a\right)+\tan\left(a\right)}{\sec\left(a\right)}$
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