Sin l , если cos l = 3/5 и -5пи/2 < l < - 2пи

Question

Sin l , если cos l = 3/5 и -5пи/2 < l < - 2пи

Answer 1

Sin^2 = 1 - cos^2
sin^2 = 1 - (3/5)^2 = 1- 9/25= 16/25

sin = 4/5