Question

If the sin 0° = 0, then which statement is true?

a. cos 90 = 1 because the cosine and sine are complements
b. cos 180 = 1 because the cosine and sine are supplements
c. cos 90 = 0 because the cosine and sine are complements
d. cos 180 = 0 because the cosine and sine are supplements

Answer 1

Apply the complement rule here

\[sin(\theta)=cos(\frac{\pi}{2}-\theta)\]

Answer 2

It is given to you here that theta = 0, so just plug that in and that should direct you to the correct choice