$\left(-4+23\right)+\left(5-10\right)-\left(45-9\right)$

$x^2+4x-9=0$

$2\tan^2-3\tan+1$

$\frac{dy}{dx}=y=\frac{\sin\left(x\right)-\cos\left(x\right)}{\sin\left(x\right)+\cos\left(x\right)}$

$-6-\left(-4\right)-17$

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

$\left(xy\right)^7$