plss answer fastn plss answer fastn 1. If 3 sin2A 2 — and A is an acute angle, then what is cos A ? Go to settrgs to acz: Share with your friends Share 0 Rashi Lokwani answered this Dear Student, 3 sin2 A = 214⇒3 sin2 A = 94⇒sin2 A = 912We know,sin2 A + cos2 A = 1⇒912 + cos2 A = 1⇒cos2 A = 1 - 912⇒cos2 A = 12-912⇒cos2 A = 312⇒ cos A = 312 (Cos A is positive since A is acute and hence lies in the first quadrant)⇒ cos A = 323⇒ cos A = 12 Regards 0 View Full Answer