Answer:30°, 45° and 60°Step-by-step explanation:Sine, Cosine and Tangent
Because the radius is 1, we can directly measure sine, cosine and tangent.
unit circle center angle 0
What happens when the angle, θ, is 0°?
cos 0° = 1, sin 0° = 0 and tan 0° = 0
unit circle center angle 90
What happens when θ is 90°?
cos 90° = 0, sin 90° = 1 and tan 90° is undefined