$5xy-3x+4xy-8x+2xy$

$5\left(4-2\right)^2+1^2\left(2^{3-5}\right)^2$

$\int\ln4x^3dx$

$\lim_{x\to-infinity}\left(\frac{1-\cos\left(x\right)}{x^2}\right)$

$\frac{dy}{dx}=\frac{y\ln\left(y\right)}{x^2-25}$

$\int\frac{3}{2\cos\left(x\right)+1}dx$

$\left(\frac{2a}{7}+r\right)^2$