Question

Find the principal value of `cos^-1  sqrt(3)/2`

Answer 1

Let y = `cos^-1  (sqrt(3)/2)`

Where 0 ≤ y ≤ π

cos y = `sqrt(3)/2`

= `cos (pi/6)`

y = `pi/6`

∴ The principal value of `cos^-1  sqrt(3)/2 = pi/6`