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


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