$-4.16+1.16$
$\frac{d}{dx}x^2cosy+6seny=21x$
$\sqrt{a\cdot b}$
$\frac{dy}{dx}=\frac{2}{e^y+e^{-y}}$
$\left(7x^2-x\right)\left(7x^2+x\right)$
$\lim_{x\to\infty}\left(\frac{x^3+3x^2+3x}{\left(x+1\right)^3}\right)$
$-6x^2-108x-510=0$
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