TrigonometryEasyTrigonometric Identities ShareTrigonometric Identities · Easy problemAn acute angle θ\thetaθ has sinθ=59\sin\theta = \dfrac{5}{9}sinθ=95. Use a cofunction identity to find cos(90∘−θ)\cos(90^\circ - \theta)cos(90∘−θ).Check Show answer Walk through it step by step Practice more like this Review this concept