$\left(e^{\left(-2x\right)}\right)\left(4e^{\left(6x\right)}-3e^{\left(4x\right)}\left(4x+1\right)-1\right)$

$\lim_{x\to-1}\left(3\left(x+2\right)\right)\left(x+1\right)$

$r2+13\le12$

$\int\frac{1}{1+25x^{2}}dx$

$4\left(x+2\right)-3\left(x-3c\right)$

$\frac{dy}{dx}=-10^{-6}\left(x^2-81\right)$

$\int-3x^7in\left(x\right)dx$