$5^2^x-2\left(5^{x+1}\right)+21=0$
$x\frac{dy}{dx}+2y=\cos\left(x\right)$
$\frac{dy}{dx}3x^8+2x+1$
$\left(2a\right)\left(-a^2\right)\left(-3a^3\right)\left(4a\right)$
$\lim_{x\to\infty}\left(\frac{2+x^e}{2x}\right)$
$7m+11;\:m=-8$
$\lim_{x\to0}\left(\frac{-ln\left(3-x\right)}{x-2}\right)$
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