Question

Compute cos(75°) to the nearest hundredth.

Answer 1

≈0.26

Explanation:

Use cos(90 - x) = sin(x)

90 - 75 = 15, therefore

cos(90 - 15) = sin(15)

Since 15 is not a standard angle, we have to use a calculator:

sin(15) ≈0.2588

Therefore,

cos(75) ≈ 0.2588

Round up,

≈ 0.26