$\left(x+1\right)^2\left(2x^2-3\right)$

$7.5y+1.6y-2$

$\frac{dy}{dx}\cos^{-1}\left(7x^8\right)$

$-4-5+7+7+3-9+10+12-42$

$\left(\frac{2}{4}x+\frac{5}{6}y-3\right)-\left(\frac{7}{4}x\:\frac{2}{6}y+4\right)$

$\frac{4^4}{4^{-8}}\:x\:4^{-14}$

$cos\left(3x\right)=-\frac{\sqrt{3}}{2}$