$\int\frac{\left(x^2+4\right)}{5x-x^2}dx$
$\left(49-43\right)-\left(18+54\right)$
$\frac{x^2-x}{x+2}$
$\frac{1-cos^2\left(x\right)}{\left(1-sen\left(x\right)\right)\left(1+sen\left(x\right)\right)}=tan^2\left(x\right)$
$\left(8x-3y+6z\right)^2$
$3x^2+2x;\:x=0;\:x=-3$
$\left(-21\right)^0$
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