$20.27-5.79$
$\frac{dy}{dx}=\left(4x+y\right)^2$
$\left(a+8\right)\left(a-2\right)-\left(a-2\right)^2$
$\left(3a-2\right)\left(3a+2\right)$
$x-8>14$
$\cos^2u-\sin^2u=1-2\sin^2u$
$\int x^2c^xdx$
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