$\left(x+2\right)\left(n\right)$

$\left(1-\sin^2\left(x\right)\right)\sec^2\left(x\right)=\cos\left(x\right)$

$\left[2\left(2+1\right)-3\left(2+2\right)\right]+1$

$\lim_{x\to0}\left(\frac{sin\left(4x^2+2x^3\right)}{\arctan\left(x+x^3\right)}\right)$

$\frac{dx}{dy}=\frac{1+y}{y^2x^2}$

$\int x\cdot\cos\left(1+x\right)dx$

$\left(-5x+9\right)\left(-5x-9\right)$