I understand after the first step, but not how the multiplication was done to go from $\displaystyle tan6t/sin2t$ to the next step. When I did it I left out the t in the denominator of $\displaystyle sin6t/t$ and the t in the numerator of $\displaystyle t/sin2t$. I just had $\displaystyle sin6t/1$ and $\displaystyle 1/sin2t$