Question

Find the principle value of cos
-1
(6)​

Answer 1

Answer:

Let 0 ≤ α ≤ π2, where α is positive smallest numerical value and satisfies the equation cos θ = x then the angle α is called the principal value of cos−1 x. Therefore, cos−1 x = 2nπ ± α, where, 0 ≤ α ≤ π and (- 1 ≤ x ≤ 1). Therefore, principal value of cos−1 ½ is π3 and its general value = 2nπ ± π3.

Answer 2

Answer:

your answer is in attachment