Question

sin (90-60)= cos 60 how ??​

Answer 1

Answer:

Step-by-step explanation:

sin(90-60) = sin(90) cos(60) - cos(90) sin(60)

                 =  1 * (0.5 )-  0 * ($\sqrt{3}$ /2)

                 = 1/2 - 0

                 = 1/2

cos(60) = 1/2

(proved)