evaluate sin (60+a)- cos(30-a) Share with your friends Share 2 Varun.Rawat answered this sin60°+a - cos30°-a=sin90° - 30°-a - cos30°-a=cos30°-a - cos30°-a as, sin90°-θ = cos θ=0 -1 View Full Answer Sagar answered this sin(60+a)-cos(30-a)= cos[90-(60+a)]-cos(30-a) cos(90-60-a)-cos(30-a) cos(30-a)-cos(30-a) =0 2