Chapter 14.2, Problem 56SB

In problems 53-56, use the properties of limits and the facts that $\underset{x\to 0}{\lim }\frac{\sin x}{x}=1\underset{x\to 0}{\lim }\frac{\cos x-1}{x}=0\underset{x\to 0}{\lim }\sin x=0\underset{x\to 0}{\lim }\cos x=1$ where $x$ is in radians, to find each limit.

$\underset{x\to 0}{\lim }\frac{{\sin }^{2}x+\sin x\left(\cos x-1\right)}{x^2}$