M6 · Advanced
Trigonometry
Exact trigonometric values
Formula
sin 30 = 1/2, cos 30 = sqrt3/2, tan 45 = 1
Rule
Common angles 0, 30, 45, 60, 90 have exact values worth memorising.
Example
cos(60) = 1/2
Tip
Sketch the unit circle to recall the signs in each quadrant.
Learn this concept
Trigonometry