Question

Find the Principal value of
cos [cos(5)]

Answer 1

Step-by-step explanation:

Since cos x is positive the principal value is in the first quadrant. We have to think about the angle of cos for which we get the value √3/2. Hence the principal value of x is π/6. Whenever we have cos θ the principal value of θ must be in [0, π].

Answer 2

Step-by-step explanation:

I hope this will help you to figure it out