Question

Express sin67°+cos75°in terms of trigonometric ratios of angle between 0° and45°

Answer 1

sin 67° + cos 75° 
= sin (90° - 23°) + cos (90° - 15°) 
= cos 23° + sin 15°

Answer 2

cos(90-67)+sin(90-75)
=cos23+sin15
(complimentary t ratios)