$\frac{\cos\left(x\right)^2}{\sin\left(x\right)^2}+\cos\left(x\right)\sec\left(x\right)$

$\left(-25\right)-\left(-35\right)$

$\lim_{x\to2}\left(\frac{x^2-3x+1}{x^2-4x+5}\right)$

$\left(2m+1\right)\cdot\left(2m-1\right)$

$343c^3-1$

$\lim_{x\to2}\left(\sqrt{x^2+1}-x\right)$

$\frac{\left(3^8\right)\left(3^{-5}\right)}{3^2}$