Question

If the cos 30° = square root 3 over 2, then the sin 60° = ________.

0, because the angles are complementary
one half, because the angles are complementary
square root 3 over 2, because the angles are complementary
1, because the angles are complementary

Answer 1

Here's a hint

\(\cos x = \sin(90^o - x)\)

Answer 2

and similarly

\(\sin x = \cos(90^o -x)\)

Answer 3

But look at that first identity I gave you.

x is 30

They told you \(\cos 30 = \dfrac{\sqrt{3}}{2}\)

So what is \(\sin 60 = ?\)