$\frac{d^2u}{xy}+u=0$
$7\sqrt{4}$
$\int\frac{x^2-3x+12}{\left(x^2-4x+11\right)}dx$
$\frac{a^2.b}{b^{-2}}$
$\left(-3x^2+4x-7\right)-\left(x^3+4x-\frac{3}{4}x\right)$
$\lim_{x\to1}\left(sin\:x\:ln\:2x\right)$
$\left(x^4-3x^2+x+1\right)+\left(x^3-x^2+5x-2\right)$
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