RD Sharma - Mathematics (Volume 1)

Book: RD Sharma - Mathematics (Volume 1)

Chapter: 4. Inverse Trigonometric Functions

Subject: Maths - Class 12th

Q. No. 60 of Very short answer

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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 tan-1 (tan 9π/8)

= tan-1 [tan (π + π/8)]

= tan-1 (tan π/8)

= π/8

tan-1 (tan 9π/8) = π/8

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