If the sin 90° = 1, then which of these statements is true? a. cos 0° = 1, because the cosine and sine are complements. cos 90° = 1, because the cosine and sine are supplements. b. cos 0° = 0, because the cosine and sine are complements. c. cos 90° = 0, because the cosine and sine are supplements.

option 1 is correct.

step-by-step explanation:

given sin 90°=1

we have to choose the correct statement.

as the sine of any acute angle is equal to cosine of its complement i.e these are complements.

sin(90-ф)=cosф and cos(90-ф)=sinф

sin 90°=cos(90-90)°=cos 0°

∴ cos 0°=sin 90°=1

as, sin(180-ф)=sin ф not cos ф

∴ sine and cosine are not supplements

hence, option 1 is correct.

answer: the dogs need to shift their focus to human scent.

its because the dogs being trained are for search and rescue thus they need to be able to track humans and their specific scent