If sin alpha = 3 /5, find the values of cos 3 alpha Share with your friends Share 2 Manbar Singh answered this We have,sin α = 35Now, sin 3α = 3 sin α - 4 sin3α⇒sin 3α = 3 × 35 - 4 × 353⇒sin 3α = 95 - 108125 = 225 - 108125 = 117125Now, cos 3α = ±1 - sin2 3α = ±1 - 1171252 = ±1 - 1396915625 = ±165615625 = ±44125 6 View Full Answer
