RD Sharma - Mathematics (Volume 1)

Book: RD Sharma - Mathematics (Volume 1)

Chapter: 4. Inverse Trigonometric Functions

Subject: Maths - Class 12th

Q. No. 59 of Very short answer

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59

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


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