Question

write activity, write correct answers
in the box.
1) Sin 20°, cos ?
2) Cos 40° = sin?​

Answer 1

Answer:

2)cos 40° = sin(90° – 40°) …[∵ cos θ = sin(90 – θ)] = sin 50°

1)i. sin 20° = cos (90° – 20°) ...[∵ sin θ = cos(90 – θ)]