$\left(6y^2-9y+4\right)-\left(-7y^2+5y+1\right)$

$\int_1^{+\infty}\left(\frac{\log\left(x\right)}{x^2}\right)dx$

$x^2-9x+90$

$192x^2=28x+1$

$\left(2x-3y\right)\left(2-\sqrt{y}\right)$

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

$\frac{d^2}{dx^2}\left(\frac{y-1}{1-x}\right)$