6-3 Double-Angle and Half-Angle Identities Section 6-3 Double-Angle and Half-Angle Identities
Explore/Discuss 2 6-3 Double-Angle and Half-Angle Identities475 and 5 1 1 cos x, since 1 1 cos x is never negative. All absolute value signs can be dropped, since it can be shown that tan (x/2) and sin x always have the same sign (a good exercise for you)...