$\left(5b^8\right)\left(-2a+3f\right)$

$-2=n+6$

$\frac{\csc\left(x\right)-\cot\left(x\right)}{\csc\left(x\right)}-\frac{\csc\left(x\right)-\cot\left(x\right)}{\cot\left(x\right)}$

$-6+\left(8-10\right)-8-\left(14+2\right)$

$9k^2-25$

$3^2\cdot3^{-1}\cdot2^3\cdot2^{-5}$

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