RD Sharma - Mathematics (Volume 1)

Book: RD Sharma - Mathematics (Volume 1)

Chapter: 4. Inverse Trigonometric Functions

Subject: Maths - Class 12th

Q. No. 58 of Very short answer

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58

Answer each of the following questions in one word or one sentence or as per exact requirement of the question:

If , find the value of x.


Given cos (sin-1 2/5 + cos-1 x) = 0


cos (sin-1 2/5 + cos-1 x) = cos (π/2)


sin-1 2/5 + cos-1 x = π/2


We know that sin-1 x + cos-1 x = π/2


x = 2/5


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