$\lim_{x\to0}\left(\cos\left(x\right)\left(1+\tan\left(2x\right)^{\frac{4}{x}}\right)\right)$
$2+\:\left(-4\right)-\left(-8\right)$
$y^2=4ax$
$\left(7xy^3-2y\right)\left(7a^3+2abc\right)$
$\frac{dy}{dx}+y^{2\:}-y=0$
$x^3+4x^2+2x$
$\left(1+3u\right)\left(3+\sqrt{-25}\right)$
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