$144=9x^2$
$2-sec^2z=1-tan^2z$
$\left(3^4+5.7\right)$
$\frac{d}{dx}4xy$
$\left(x\:-\:y\right)\left(x\:+\:y\right)\:=\:x.x\:+\:x.y\:-\:y.x\:-\:y.y$
$\int\:\:x^2\left(x^3-4\right)^{12}dx$
$u=ln\left(\sqrt{x^2+y^2}\right)$
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