Question

for each following values of cos θ, determine the radian value of θ if π≤θ≤2π.
a) \[-\frac{ 1 }{ 2 }\]
b) \[\frac{ \sqrt{3} }{ 2 }\]
c) \[-\frac{ \sqrt{2} }{ 2 }\]

Answer 1

hint : cos theta = 1/2 : radian value of theta in first quadrant is pi/3
for sqrt3/2 its pi/6
for sqrt2/2 over 2 its pi/4