Find the sine, cosine, and tangent of 45 degrees.

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