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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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).


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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