Use a calculator to find the approximate value of arccos (0.67).

The approximate value of arc cos (0.87) is 29.54°

Step-by-step explanation:

we know that

The arc cosine of x is defined as the inverse cosine function of x

so

if y=cos (x)

then

arc cos (y) = x

In this problem we have

y=0.67

so

x=arc cos (0.87)

using a calculator

x=29.54°