$\frac{dy}{dx}=\frac{\left(x^2+4-x\right)^{\frac{1}{2}}-x}{2}$

$45+\left(-57\right)-\left(-15\right)$

$\int\sqrt{9x+1}dx$

$\lim_{x\to\infty}\left(\frac{9x^5-6x^4+2x^2}{5x^6-3x^2}\right)$

$sin^{-1}\left(tan\left(\frac{\pi}{4}\right)\right)$

$\cos\left(\frac{2\pi}{5}\right)\cdot\cos\left(\frac{\pi}{5}\right)\cdot40$

$\frac{2x^4y^3}{4yx^4}$