$\frac{1}{1-\:sin\left(x\right)}+\frac{1}{1+\sin\:\left(x\right)}=2csc^2x$
$648.20-40.25$
$\frac{dy}{dx}=\frac{\left(x^2y-y\right)}{y+1}$
$\frac{sen^2x}{2senx}$
$\lim_{x\to\infty}\cot\left(\frac{\pi}{x}\right)$
$\frac{8y^2+4y}{2y}$
$19.8-8$
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