$49x^2-140x+100$
$\left(-\frac{20}{7}\right).\left(-7\right)$
$xy'=y^2+y$
$\int\left(\frac{3cosx+8sinx}{cos^3x}\right)dx$
$\left(2x+3y-5a\right)^3$
$\int\left(6x\cos\left(x\right)-\cos\left(x\right)\right)dx$
$ydy=7xdx$
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