Question

If α = 3 sin⁻¹ (6/11) and β = 3 cos⁻¹ (4/9),where the inverse trigonometric functions take only the principal values, then the correct option(s) is(are)
(A) cos β > 0 (B) sin β < 0
(C) cos(α + β) > 0 (D) cos α < 0

Answer 1

Answer:

C) cos (α + β) > 0 α = 3 sin⁻¹ (6/11) and β = 3 cos⁻¹ (4/9),where the inverse trigonometric functions take only the principal values, then the correct option(s) is(are)

Step-by-step explanation:

option c