$\int\cot\left(-\frac{1}{3}r\right)dr$
$\left(3x\right)^2\left(-3a\right)$
$\int8.58e^{0.286x}dx$
$-36\left(-85+86\right)$
$\int\:\left(1-x^3+5x^5-3x^7\right)dx$
$\left(8-11\right)-\left(3+1-4-6\right)$
$x^8-1\:sobre\:1\:+\:x^4$
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