$\"\"$

The trigonometric function $\"\"$ .

$\"\"$ (Original function)

$\"\"$ (Apply inverse cos function each side)

$\"\"$ (Substitute: $\"\"$ )

$\"\"$ (Use calculator)

$\"\"$ (Nearest degree)

Therefore, the angle of $\"\"$ is nearest degree is $\"\"$ .

$\"\"$

Rounded to the nearest degree $\"\"$ .