If the sin 90° = 1, then which statement is true?
cos 0° = 1, because the cosine and sine are complements
cos 90° = 1, because the cosine and sine are supplements
cos 0° = 0, because the cosine and sine are complements
cos 90° = 0, because the cosine and sine are supplements

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

step-by-step explanation:

we are given that sin 90° = 1

the sine of any acute angle is equal to the cosine of its complement.

the cosine of any acute angle is equal to the sine of its complement.

we are given

⇒

⇒

since we are given that sin 90° = 1

⇒

thus option a is correct .

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

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

hope it