$cos^2x\:cot^2x\:+cos^{2x}$

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

$108-234-16$

$\frac{d^2}{dx^2}\left(1-\frac{4}{x}\right)$

$4m-\left[2m+\left(n-3\right)\right]+\left[-4n-\left(2m+1\right)\right]$

$\frac{\left(1-\sin\left(x\right)^2\right)\left(1+\sin\left(x\right)^2\right)}{\cos\left(x\right)^2}=1$

$x\left(x^2+1\right)-2\left(x^2+1\right)$