$xy\:\frac{dx}{dy}=c$
$\lim_{x\to0}\left(\frac{\tan\left(x\right)+\sin\left(x\right)}{x^2+x}\right)$
$\frac{x}{6}+21<\frac{x}{7}+22$
$\left(\frac{\left(1-tan^2x\right)}{1+tan^2x}\right)+1$
$2x^2-16x<0$
$2x^2yz-2xy^2z+2x^2y^3$
$4x-7y+25=0$
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