$\left|-0.75\right|-0.25$
$64x^9+216y^{15}$
$\frac{dy}{dx}-\frac{y^2}{x^2}=\frac{2y}{x^2}$
$121+198x$
$\left(m^2-4m+6\right)\cdot\left(m+8\right)$
$\frac{1}{\tan^2\left(a+1\right)}+\frac{1}{\cot2\left(a+1\right)}$
$\frac{1-\sin^2\left(a\right)}{\cos\left(a\right)}$
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