$-13\cdot7+-16$
$\frac{\sqrt{1}+x}{\sqrt{1}-x}$
$\left(-2-2^2\right)$
$2x^2+10\cdot4x^2+6x^2+3x^2$
$\left(e^{2x}+4\right)y'=y$
$\lim_{x\to-\infty}\left(\frac{2x}{e^{x^2}}\right)$
$-3^{15}$
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