Question

cos 5° – sin 25° is equal to (1) sin 20° (2) sin 30° (3) sin 35° (4) sin 60°

Answer 1

Your answer is.....
..............,............................

= cos5° - sin25°
=cos(90°- 85°) - sin25°
= sin85°- sin25°
= sin(85°-25°)
= sin60°