$\int\frac{x+5}{x^2+2x+5}dx$
$36\cdot34$
$\left(3ab+5x\right)\left(3ab+2\right)$
$\frac{3x+\frac{1}{2}}{-4}>0$
$\left|68+9\right|+\left(-62\right)$
$cos\left(5x\right)-cos\left(3x\right)=-2cos\left(x\right)sen\left(4x\right)$
$x^2-18x=19$
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