RD Sharma - Mathematics (Volume 1)

Book: RD Sharma - Mathematics (Volume 1)

Chapter: 4. Inverse Trigonometric Functions

Subject: Maths - Class 12th

Q. No. 15 of MCQ

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15

Choose the correct answer

Let . Then f(8 π/9) =


We are given with,


We need to find .


We just need to find put in f(x).


So,



Simplify the equation,




Using trigonometric identity,






Using trigonometric identity,


cos (-θ) = cos θ



Using property of inverse trigonometry,


cos-1(cos θ) = θ


Chapter Exercises

Exercise 4.1
Exercise 4.2
Exercise 4.3
Exercise 4.4
Exercise 4.5
Exercise 4.6
Exercise 4.7
Exercise 4.8
Exercise 4.9
Exercise 4.10
Exercise 4.11
Exercise 4.12
Exercise 4.13
Exercise 4.14
Very short answer
MCQ

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