Question

sin54°+cos67°=sin23°+cos36°​

Answer 1

sin(90- 36)+ cos 67 = sin(90 - 67) +cos36

cos 36 + cos 67 = cos 67 + cos 36

=0.

Answer 2

Using that, we can write cos (36) = cos (90 - 54) = sin (54) Now, we try to find the proof of the new equation sin(54) - sin (18) = ? 1. ... Can you solve sin 23 ...