$\int3x\:sen\left(2x\right)dx$
$\left(x+15\right)\left(x-12\right)$
$\left(10a+3b\right)\cdot\left(10a-3b\right)$
$5\cdot\frac{12}{5}x$
$4x^2-18x+13$
$v^2-b^2$
$\int\left(e^xtan^3\left(e^x\right)\right)dx$
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