$3x\left(x+5\right)-4\left(x+5\right)$

$x\sqrt{1+y^2}=\:-y\sqrt{1\:-\:x^2}\frac{dy}{dx}$

$ay^{2-12ayx+36ax^2}$

$xy-y^2+ax-ay$

$123-321x\ge\:122-320x$

$15.66-\left(-2.317\right)+\left(-17.977\right)$

$\left(a\sin\left(x\right)+b\cos\left(x\right)\right)^2+\left(b\sin\left(x\right)-a\cos\left(x\right)\right)^2$