$$\frac{\sin\left(x\right)}{1+\cos\left(x\right)}=1$$

$$35-3\cdot8$$

$$+6m^2n-21m^2n+5m^2$$

$$10x^2-10x+13$$

$$\lim_{x\to-4}\left(x-1\right)$$

$$\lim_{x\to-2}\left(\frac{1-e^{-jx\pi}}{\pi\left(4-x^2\right)}\right)$$

$$\left(-11\right)\left(-2\right)\left(-12\right)\left(2\right)\left(-31\right)$$