$\cos\left(\frac{\pi}{4}+\frac{x}{2}\right)\sin\left(\frac{\pi}{4}-\frac{3\pi}{2}\right)$

$\frac{d}{dx}b^2\cdot x^2+a^2\cdot y^2=a^2\cdot b^2$

$9+4+13+2$

$\left(\:-\:3\right)\:\cdot\:3\:\cdot\:\left(\:-\:3\:\right)\cdot\:\left(\:-\:3\:\right)\:\cdot\:3\:\cdot$

$k^8y^{12}-1$

$\sqrt{x^2+4x}-x+2$

$\:\left(r-t\right)^4$