$tan^2\left(-x\right)+sec^2\left(x\right)$
$\int_{-1}^1-12xdx$
$x^3+5x^2-17x-21$
$\int\frac{e\sqrt{1^x}}{\sqrt{1^x}}dx$
$\lim_{x\to0}\left(\frac{9}{x\left(x+3\right)}\right)$
$39^2$
$5-9.9$
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