Answer each of the following questions in one word or one sentence or as per exact requirement of the question:
Find the value of 
.
Given cos-1 (cos 13π/6)
= cos-1 [cos (2π + π/6)]
= cos-1 (cos π/6)
= π/6
∴ cos-1 (cos 13π/6) = π/6
1
Answer each of the following questions in one word or one sentence or as per exact requirement of the question:
Find the value of .
Given cos-1 (cos 13π/6)
= cos-1 [cos (2π + π/6)]
= cos-1 (cos π/6)
= π/6
∴ cos-1 (cos 13π/6) = π/6