$\left(3a+1\right)\left(2a+1\right)$
$-21a^2.b^2:7ab^2$
$\int_0^{15}4xdx$
$\int sec^66xdx$
$8-\left(-5-3\cdot4+5+\left(8-\left(6-1\right)\cdot3+\left(2-5\right)\cdot4\right)\right)$
$x^2\frac{dy}{dx}-7x+15=0$
$\frac{d}{dx}sen\left(xy\right)-7x=y$
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