$\int e^{3x}\cdot cos\left(7x\right)dx$
$x^2+20x^2-6x$
$\int\frac{2y-1}{2y^2-1}dy$
$4b^2+3b+10=0$
$x\left(x-1\right)-5x\left(x-2\right)-2$
$x^2+15x+542$
$-42\:x\:-6$
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