Find dy/dx if y=sin-1 (3sinx+4cosx/5). Share with your friends Share 8 Manbar Singh answered this We have,y = sin-13 sin x + 4 cos x5⇒y = sin-135 . sin x + 45 . cos x Let cos α = 35now, sin α = 1 - cos2α = 1 - 352 = 1 - 925 = 45Now, y = sin-1sin x . cos α + cos x . sin α⇒y = sin-1sinx+α⇒y = x + α⇒dydx = 1 + 0 = 1 15 View Full Answer