Question

If the sin 90º = 1, then which statement is true? ​

Answer 1

cos 0° = 1, because the cosine and sine are complements

Explanation:

Here is the formula: sin 0 = cos (90°- 0) or cos 0 = sin (90°- 0)

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