$\left(-8\right)\left(+6\right)-\frac{\left(-75\right)}{\left(+5\right)}$

$9x+3y+4x+2y$

$\frac{\left(4\right)}{\left(x-9\right)}-\frac{\left(3\right)}{x+7}$

$\int5\cos\left(\pi x\right)dx$

$\frac{d}{dx}ln\left[tg\left(\sqrt{x}\right)\right]^3\:+arc\:sec\left(y\right)$

$\lim_{x\to a}\frac{\left(2x+a\right)^2-5a^2}{-2x}$

$x-4\sqrt{3x^2}-15x+8$