$\lim_{x\to0}\:\left(\frac{sen\:\left(x^2+x\right)}{x^2+x}\right)$
$6y+x=8$
$3x-1\le2x+2$
$\int\frac{x^2}{\sqrt{1-4x^3}}dx$
$\cos\left(x\right)+2=\:3cos\left(x\right)\:$
$\int_0^13\left(1+\sqrt{x}\right)^6dx$
$\left(\frac{9^7}{9^3}\right)^2$
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