ANSWER:
Separate the quotient in two terms
STEP-BY-STEP EXPLANATION:
We have the following:
[tex]\begin{gathered} \tan x=\frac{\sin x}{\cos x} \\ \tan x=\frac{1}{\cos x}\cdot\sin x \end{gathered}[/tex]Therefore, the step shown in the image is to separate the quotient in two terms