$\frac{d}{dx}\left(z^2+6xy\right)\sqrt{\left(x^3+5\right)}=2$

$m^2+2m-36$

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

$\ln\left(x+4\right)+\ln\left(x+3\right)=\ln\left(x-13\right)$

$y'=2x+1$

$\left(7d^2+3f^3\right)\left(7d^2-3f^3\right)$

$\lim_{x\to\infty}\left(\frac{3\ln\left(x^2+2\right)+7x^2}{x^2+5}\right)$