Hi guys, just having few problems sketching

f(x) = sin(2x)

i basically did atable

x -2 -1 0 1 2

y

and input the x values into the equation to get a y value but then i try graph it on "GraphFunc online" and it gives me different y values for the same x values. Any ideas? i know what a sin sketch looks like but then i dont know how to include the 2x etc .....