Question

IN 205 20 Workout 19) If cos, is os B and cos = 2/3 find cos (a +B) 20) Prove the identity escax secx = sec²x +CSC² = 1 Doiven the angle in standard positon with the point E117,-4 lying on the bominal side of a give the exact trisonometrie function values of O.

Answer 1

18) Find cos 20 COSAS cose = les sino = .cos(20) = coše - sino = (2-6 Workout 19) If col find cos (atß) 3 12 and ca 13 cosd = 12 cosB = 3/5 sina= 5/5 sinp=4/5 cosla+B)= cosa cosß - sina sinß 1 = 16 20) Prive the identity C5C2x sect = Sex ²x +CSC²- Two equal to not possible Y=-4 Given the angle ein standard position with the point 497,-4) ying on the terminal side of a give the exact trigonometrlet function values of O. X=-457 V sin z={{-457)²+(-4)= 8rE • sino = = = - sad .6058 = = =-vo . tone = ķ = csc0 = 2 = -282 · seco = = = -2you ·cots - - VI