Question

use a calculator to find the approximate value of the expression. round the answer to two decimal places. the cosine of the complimentary angle of 60°. a. 0.50 c. 0.25 b. 0.86 d. 0.71 please select the best answer from the choices provided.

Explanation:

Step1: Find complementary angle

The complementary angle of $60^{\circ}$ is $90^{\circ}- 60^{\circ}=30^{\circ}$.

Step2: Calculate cosine value

$\cos(30^{\circ})=\frac{\sqrt{3}}{2}\approx0.866\approx0.86$ (rounded to two - decimal places).

Answer:

B. 0.86