$\frac{\sec^2\left(x\right)-\tan^2\left(x\right)}{\sec\left(x\right)+\tan\left(x\right)}+\tan\left(x\right)$

$\left(6gb^6\right)^3$

$17r+r^2=-52$

$\frac{4x^7y^8}{4x^8y^6}$

$\int e^{-x}\cdot\cos\left(t-10x\right)dx$

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

$\left(25\cdot14\right)^0$