$\int\frac{x^2-x+1}{\left(\left(x+1\right)\left(x-3\right)\right)}dx$
$x^2-5x-4\ge0$
$2x+\left(2-x\right)\cdot\left(-3\right)$
$-5-2^3$
$+3-1-6-7+4-3-2+11+9+3-22$
$-xy-6xy+9xy+xy$
$\int\frac{\left(sen^32x\right)}{\left(cos^62x\right)}dx$
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