$\left(x+3\right)+\left(x+3\right)$

$\frac{3c^3+7c^2-4c+16}{c+3}$

$\frac{\left|-\frac{40}{\left(-2\right)}\right|}{2^2}$

$\int\left(9+x^2\right)^{\frac{3}{2}}dx$

$\left(1+x^2\right)y'+1+y^2=0$

$\frac{\tan^2\left(40\right)-\tan^2\left(20\right)}{1-\tan^2\left(40\right)\tan^2\left(20\right)}$

$2\left(2-7\right)+3\left(1-5\right)+8$