$\frac{dx}{dt}-x^3=x$
$cos\:x\:xos\:2x\:+sin\:x\:sin\:2x$
$\frac{3}{\left(2\right)\left(1+x\right)}$
$\frac{1}{s+2}\frac{10}{s+5}$
$\:x=\frac{5\pi\:\:}{6}+2\pi\:\:n$
$x^2+14x\:+7$
$\left(3x-2y\right)^2-\left(4x-y\right)^2$
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