$\left(x^3+1\right)\cdot\left(x^3-4\right)$

$x^2-2x=-x^2-24x+144$

$\frac{\left(sin\left(\theta\:+b\right)+sin\left(\theta\:-b\right)\right)}{sin\left(\theta\:+b\right)+sin\left(b-\theta\:\right)}$

$-5.73-3.4$

$\frac{24x^5}{-4x^2y}$

$\lim_{x\to1}\left(\frac{n^2}{2^n}\right)$

$\left(3\right)^2+2\left(3\right)\left(-2\right)-\left(-2\right)$