$y2\left(a-x\right)=x^3$

$3\left(x^2+3x\right)^3$

$\int3x\cos\left(\frac{x}{3}\right)dx$

$\int\frac{x^2+18x-9}{x^3-9x}dx$

$20x^3y+5x^2y^2-10xy^3$

$\log\left(7x+1\right)=2\log\left(x+3\right)-\log\left(2\right)$

$\left(-4+1\right)^2.\left(3-6\right)^3.\left(-1-2\right)$