Question 425631
Using the trigonometric identity, {{{cos(A-pi/2) = sin(A)}}}, with {{{A=2theta}}}
So we are left with {{{sin(2theta) = 1/2}}} -> {{{2theta = arcsin(1/2)}}}
{{{2theta}}} = 30 degrees, or {{{theta}}} = 15 degrees = {{{15*pi/180)}}} = 0.2618 radians