$cos\left(x\right)+cos\left(x\right)cos\left(y\right)-\left(sin\left(y\right)+sin\left(x\right)sin\left(y\right)\right)y'=0$

$x^2-3x=28$

$4x^2-12x+944$

$\left(-51.66\right)^2-4\left(16.81\right)\left(39.69\right)$

$2\cdot\sqrt{25a^2}\cdot\sqrt{4b^2}$

$\int\frac{2x-11}{x^3-2x^2}dx$

$\lim_{x\to2}\:\sin\left(x-2\right)^{x-2}$