Solved example of special quotients

The difference of the squares of two terms, divided by the sum of the same terms, is equal to the difference of the terms, in other words:<ul><li>$\displaystyle\frac{a^2-b^2}{a+b}=a-b$</li><li>Where the value of $a$ is $\cos\left(x\right)$</li><li>and the value of $b$ is $\sin\left(x\right)$, therefore:</li></ul>

Both expressions are equal