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

Step-by-step explanation:

Complement to 60° = 30°

cos(30°) = sin(60°) = 0.866

0.866.

Step-by-step explanation:

We use the identity

sin x = cos (90-x)

So the cosine of the complementary angle is also 0.866.

correct answers below:

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