$\lim_{x\to\frac{\pi}{2}}\left(\frac{\cos\left(ax\right)}{\cos\left(bx\right)}\right)$

$\left(-5.683\right)\cdot4$

$45h^2+120hw+80w^2$

$\frac{d}{dx}\left(\left(e^{4x}+2\right)^{10}\right)$

$x2+x+2=0$

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

$\left(\frac{1}{6}\right)^{-2}$