Question

Principal
value
cos inverse (cos 2x) is​

Answer 1

Step-by-step explanation:

If the principal value of cos−1 x is θ then we know, 0 ≤ θ ≤ π. Therefore, theprincipal value of cos−1 (- √3/2) is π - π6 = 5π6.What is the principal value of Cos inverse minus one by two?

We know that Cos function is negative only in 2 quadrant in its range. 120 is 2π/3. Hence Principal Value of Cos⁻¹ ( -1/2 ) is ( 2π/3 ).