Half angle identities :
Also called half number identities, half angle identities are trig identities that show how to find the sine, cosine, or tangent of half a given angle.
Example #1
Find the exact value of the expression sin 120 degrees by using the half angle formula
Find the exact value of the expression sin 120 degrees by using the half angle formula
STep by step video:
Using half angle identities to evaluate trigonometric expressions