$x^{2+x+1}$
$\frac{x^2-5x}{x+1}.\frac{x+1}{x^2+3x}$
$y^1=1+x+y+xy$
$sen^2x+cos^2y=\frac{1}{8}$
$\left(6a-b\right)^2$
$\frac{x-1}{x}\le4$
$\int_{0.618}^0\left(\frac{-10x^2+5x+5}{2\sqrt{1-x-x^2}}\right)dx$
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