Question 954076
{{{sin(theta)=(2k)/sqrt((-k)^2+(2k)^2)}}}
{{{sin(theta)=(2k)/sqrt(k^2+4k^2)}}}
{{{sin(theta)=(2k)/sqrt(5k^2+4k^2)}}}
{{{sin(theta)=(2k)/(sqrt(5)k)}}}
{{{sin(theta)=2/sqrt(5)}}}