Question

If the sin 30° is one half, then the cos ________° = ________. (1 point)

60°; one half

30°; square root 2 over 2

60°; square root 3 over 2

30°; 1

Answer 1

Answer:

cos60° = $\frac{1}{2}$

Step-by-step explanation:

using the cofunction identity

• cos(90 - x)° = sinx°

given

sin30° = $\frac{1}{2}$ , then

cos(90 - 30)° = cos60° = $\frac{1}{2}$