$\frac{1\:-\:cos\:\theta}{sin\left(\theta\right)}=\:csc\:\theta\:-\:cot\:\theta$
$\frac{15xy}{5}$
$\int\left(\frac{x^2-16}{x}\right)dx$
$\int\left(\frac{x^3}{\sqrt{x^2+8}}\right)dx$
$x^2+\left(y+6\right)^2=2$
$\left(-43\right)-\left(-19\right)$
$\frac{x}{3}-3\le-6$
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