$\lim_{x\to1}\left(\frac{x^2+x-3}{-1}\right)$

$\left(2x\:+\:1\right)\left(2x-5\right)$

$\int75x^2\cdot\cos\left(3x\right)dx$

$25\:c\:-\:10\left(15\:-\:c\:\right)$

$\frac{dy}{dx}=\frac{y^3}{\left(x+4\right)}$

$\sqrt{\left(x+1\right)\left(x-1\right)+1}+x+1$

$\int-6x\:dx$