Use a calculator to calculate the value of the angle [[$ \alpha $]]. Round the answer to the nearest degree.

a) [[$ \cos \alpha = 1 $]]

[[$ \alpha = $]] °

b) [[$ \cos \alpha = 0.2 $]]

[[$ \alpha ≈ $]] °

c) [[$ \cos \alpha = 0.122 $]]

[[$ \alpha ≈ $]] °