Find the principal value of each of the following:
We know that for any x 
[–1, 1], 
represents an angle in [0, 
].
= an angle in [0, 
] whose cosine is 
.
= 
= 
4
Find the principal value of each of the following:
We know that for any x [–1, 1], represents an angle in [0, ].
= an angle in [0, ] whose cosine is .
=
=