$5-15+4^2+1$
$6\left(4x+11\right)+2\left(x+8\right)$
$2ab\left(3\right)\left(-7\right)$
$\frac{3x^3-20x^2+37x-20}{x-4}$
$\int sen^53x\cdot cos3x$
$50tu2+49tu2+42tu2+18tu2+tu2$
$-2\sin\left(x+45\right).\cos\left(x+45\right)$
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