solve for 0 <= t <= 2pi
cos t = 1/2
Give your answers in increasing order
t =
t =
cos pi/3 = 1/2
so, t = pi/3
That's the reference angle. cos is positive in QI and QIV, so the other solution is
t = 2pi - pi/3
cos t = 1/2
Give your answers in increasing order
t =
t =
so, t = pi/3
That's the reference angle. cos is positive in QI and QIV, so the other solution is
t = 2pi - pi/3