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Trigonometry (Exact Values)
The following table provides the exact values of cosine and sine functions to memorize.
Exact Values to Memorize (You have no choice. So, bite the bullet.)
| Radians | 0 | π/6 | π/4 | π/3 | π/2 |
| cos(θ) | 1 |  |
 |
 |
0 |
| sin(θ) | 0 | |
|
|
1 |
The exact values of all six trigonometric functions at other standard angles from –∞ and ∞ are immediate consequences of the values in the table. You are expected to be able to produce them.
Caution: On exams, you will lose credit every time you write a decimal answer for the value of a trigonometric function, unless otherwise specified. You must produce exact values.
A nice picture to go with the table is this:
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Disclaimer • Updated September 4, 2008
Email: mitsuma@kutztown.edu
Phone: +1 (610) 462-WPJW
Phone: +1 (610) 462-WPJW