$\sqrt{1-4x^2}\:\frac{dy}{dx}\:=x$
$\frac{ds}{dt}=s+1$
$\frac{125-343z^{15}}{5-7z^5}$
$-21y^14+7y^10-7y^5:7y^2$
$\left(\sqrt{3-x}\right)\left(\sqrt{3+x}\right)$
$\frac{dy}{dx}+\left(5\cdot y^{-2}\right)=\left(x\cdot y^{-2}\right)$
$\csc x+\sin x=\cot x\cdot\cos x$
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