$$\lim_{x\to0}\left(\frac{x+1}{1+\sin\left(x\right)}\right)^{\frac{1}{x^2}}$$

$$\left(-2g^2-4m^2\right)\left(-2g^2+4m^2\right)$$

$$3x^2-2x-7$$

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

$$a+2b+a-b$$

$$11a-13a+15a$$

$$\lim_{x\to-1}\left(\frac{5x^4+2x^3+2x-1}{x+1}\right)$$