RD Sharma - Mathematics (Volume 1)

Book: RD Sharma - Mathematics (Volume 1)

Chapter: 4. Inverse Trigonometric Functions

Subject: Maths - Class 12th

Q. No. 2 of Exercise 4.7

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2

Evaluate each of the following:

The value of cos is


Now,


The question becomes cos–1()


Let cos–1 = y


cos y =


= –cos


= cos


cos


The range of principal value of cos–1 is [0,π] and cos


Therefore, the value of cos–1(cos) is.


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