Question

If the sin 30° is 1/2, then the cos ____° = _____.


A. 60° ; 1 over 2

B. 30° ; square root 2 over 2

C. 60° ; square root 3 over 2

D. 30° ; 1

Answer 1

wouldn't it be "A"?

Answer 2

Half of what?

Answer 3

Yes it would be A

\[\large sin(x) = cos(90 - x)\]

so

\[\large sin(30) = cos(90 - 30) = cos(60)\]

Answer 4

Thank you ! :O :D ^.^

Answer 5

haha anytime hun :)