This is for my trig class. Thanks for the help! Jan 3 | Serenity from Ellsworth, WI | 1 Answer | 0 Votes Mark favorite Subscribe Comment
sin x = 4/5 cos x = -3/5, by 3-4-5 Pythagorean triple and Q. II cos x/2 = sqrt[(1/2)(1+cos x)] = sqrt[(1/2)(1-3/5)] = sqrt(5)/5 Jan 3 | Robert J. Comment