Trigonometry

Triangles and the unit circle.

01

sin(30°) = ?

02
Locate 135° on the unit circle.
03

If sin θ = 3/5, find cos θ (θ acute).

04

Solve: tan x = 1 on [0, 2π)

05

Law of cosines for sides 7, 9, included angle 60°. Find the third side.