$1-20609$

$108x+27$

$\frac{x^3}{x-4}$

$x^3y^5\left(3x^2y\right)$

$\int_2^6\left(6x\right)dx$

$\int\frac{\left(x-1\right)}{\left(\left(x-3\right)\left(x+1\right)^2\right)}dx$

$\cos3\left(a\right)=\cos\left(a\right)\left(1-2\sin\left(a\right)\right)\left(1+2\sin\left(a\right)\right)$