$\lim_{x\to4}\left(x^2-16\right)$
$\frac{169x^2-16y^4}{13x+4\:y^2}$
$3\cdot5-5$
$\left(4x^3y+9\right)dx+\left(x^4-1\right)dy=0$
$x+6<4-3x$
$2^2+2a+ab+b+1$
$\sqrt{1+\left(\frac{x}{y}\right)^2}$
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