Question

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

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

Answer 1

@Directrix

Answer 2

Attached is a chart of the trig cofunctions. The "co" in cofunctions is for "complementary" as in complementary angles.

You'll see sine and cosine and the relationship on the chart.

Answer 3

so a then. Thank You c:

Answer 4

You are welcome. Print that chart so you can review it, okay?

Answer 5

okay !