Answer
$${\text{FALSE}}$$
Work Step by Step
$$\eqalign{
& \int {\frac{{2{e^{2x}}}}{{\sqrt {9 - {e^{2x}}} }}dx} \cr
& {\text{Let }}u = {e^x}{\text{, }}du = {e^x}dx{\text{ and }}a = 3 \cr
& \int {\frac{{2{e^{2x}}}}{{\sqrt {9 - {e^{2x}}} }}dx} = \int {\frac{{2u}}{{\sqrt {{a^2} - {u^2}} }}du} \cr
& {\text{False, it is not possible to use the arcsine rule}} \cr} $$