$0 - a + 4 - ( 2 + a - 3 ) 4$

$2x^2-72x=0$

$\lim_{x\to\infty}\left(\frac{5x^3}{e^{9x}}\right)$

$u_g=mgh$

$\lim_{x\to1}\left(\frac{1+co\left(3\pi x\right)}{x-1-lnx}\right)$

$\int\left(\frac{t}{5}\right)\left(\sqrt{148-t^2}-4\right)dt$

$\frac{dy}{dx}+\frac{10y}{2x-5}=10$