RD Sharma - Mathematics (Volume 1)

Book: RD Sharma - Mathematics (Volume 1)

Chapter: 4. Inverse Trigonometric Functions

Subject: Maths - Class 12th

Q. No. 4 of Exercise 4.2

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Find the principal value of each of the following:

Let .

Then, cos y =

= –cos

= cos

= cos

We know that the range of the principal value branch of is [0,] and cos

Therefore, the principal value of is .

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