$\left(1+\frac{1}{n}\right)^n\cdot5^n\cdot x^n$

$5+7\cdot8-2$

$-3x+x\left(8x-9\right)$

$\left(\sin\left(a\right)+\cos\left(a\right)\right)\cdot\tan\left(a\right)-\sec\left(a\right)=\sin\left(a\right)-\cos\left(a\right)$

$\frac{x}{\sqrt{5-4x-x^2}}$

$\int\:e^x\left(9+e^x\right)^7dx$