Question

Given that sin 60° ≈ 0.866, write the
cosine of a complementary angle

Answer 1

Explanation:

Complement to 60° = 30°

cos(30°) = sin(60°) = 0.866

Answer 2

0.866.

Explanation:

We use the identity

sin x = cos (90-x)

So the cosine of the complementary angle is also 0.866.