Question

Express sin 77 degrees + cos 67 degree in term of trigonometric ratios of the angle between 0° and 45°​

Answer 1

Hope it will help you...

Answer 2

Heyaaa !!!

▶As,

➡sin theta = cos ( 90 - theta)

▶and

➡Cos theta = sin (90 - theta)

▶So,

➡= sin 77° + cos 67°

➡= cos ( 90° - 77° ) + sin ( 90° - 67° )

➡= cos 13° + sin 23°

Thanks..