How do you find exact value of #sin (pi/ 6)#?
For trigonometry, it is imperative to memorize a tool known as the Unit Circle. This is a circle with a radius of
When you see a trigonometric function such as sine (or sin(
In this case,
In the future, you should memorize all the major points on the unit circle along with their reference angles and you'll be able to find these answers quickly.
The fastest way is to look at the trig table, titled "Trig Functions of Special Arcs".
This table gives -->
Use trig identity: sin (a - b) = sin a.cos b - sin b.cos a