$12t+30s$
$\frac{8x^2+2x+3}{4x^2+6x+1}$
$\left(m-10\right)\left(m+7\right)$
$\cos x\:por\:\left(1+tgx\right)=\sin x\:por\:\left(1+ctgx\right)$
$\int\left(x-9\right)\:ln\left(x\right)\:dx$
$\left(2m-n^2\right)^2$
$\left(2x+3y+4\right)\left(2x+3y-3\right)$
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