$\left(5\cdot3\cdot25\right)$

$\lim_{x\to0}\left(\frac{\left(1-x\right)^n-1-nx}{x^2}\right)$

$\frac{8x^3+y^3}{2x+y}$

$-cos\left(3t\right)sin\left(t\right)$

$\left(x^{a+b}-y^{a-c}\right)^3$

$\left(9xy\right)\left(-2x\right)$

$\int\frac{csc\left(7+x^{-1}\right)}{x^2}dx$