$3-6-2+5+2+6$

$a-22=-31$

$\:tan\:\left(x\right)=sec\:\left(x\right)-\frac{cos\left(x\right)}{sin\left(x\right)+1}$

$\left(7mn+2fg\right)\left(7mn-2fg\right)$

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

$\frac{dy}{dx}=\frac{6y}{x}-x^{\frac{2}{5}}$

$-8-\left(-5\right)+\left(-20\right)$