$\left(o-6\right)^2$

$-4+\left(-6+1\right)+3-\left(3-\left(1-2\right)+2\right)+1-7$

$6x^2-8x-8$

$\left(\frac{28}{15}\right)\left(\frac{5x}{7y}\right)$

$\frac{dy}{dx}=\frac{\ln\left(x\right)}{x^2}$

$\int\frac{12x+18}{x^3+9x}dx$

$\int_0^{\pi^2}\left(\cos\left(\sqrt{x}\right)\right)dx$