$\frac{9^2}{4}-ab+b^2$

$\frac{dy}{dx}=\left(x+y+9\right)^2$

$\frac{2x^3-4x^2+3x-7}{x}$

$\frac{dy}{dx}=1+x+y+yx$

$\frac{\cot\left(x\right)}{\sin\left(2x\right)}=\frac{1}{2\left(1-\cos^{2}\left(x\right)\right)}$

$\left(-69\right).\left(-4\right).\left(-8\right)$

$64y^2-32x+4$