$\frac{\sec^2\left(x\right)}{\cot^2\left(x\right)+1}$
$18x^3-9x^2$
$\int\left(\frac{7x^3-4x+2}{x^3-x^2}\right)dx$
$\left(26\right)^0$
$\ln\left(\frac{x^4\sqrt{y}}{\left(z^2\right)}\right)$
$\frac{c}{7}+2=17$
$\frac{3n^4+n^3-7n^2-2n+2}{n^2-2}$
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