$x^2-12x-133=0$

$\lim_{x\to\infty}\left(-\frac{7x^6}{sin\left(\frac{1}{7x^2}\right)}\right)$

$\left(a-b\right)^9-125\left(c-d\right)^6$

$1^2-3$

$x^2-14x-2$

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

$\frac{dy}{dx}=5x^2y,\:y\left(3\right)=2$