Question

If the sin 90° = 1, then the cos 0° = _____. (1 point)

Answer 1

sin 90° = 1

cos 0° = 1

There's a simple formula : sin θ = cos (90°- θ) or cos θ = sin (90°- θ)

So : cos 0° = sin (90° - 0°) = sin 90° = 1

Answer 2

cos 0° = 1

Explanation:

In given triangle sin 90° = 1

and we know the relation between cosine and sin is represented by

sin x = cos (90-x)

Therefore, sin 90° = cos ( 90-90 )

= cos 0°

= 1

Therefore, cos 0° = 1 will be the answer.