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Evaluate cos[sin-1 14+sec-1 43]

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Question

Evaluate `cos[sin^-1  1/4 + sec^-1  4/3]`

Sum
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Solution

`cos[sin^-1  1/4 + sec^-1  4/3] = cos[sin^-1  1/4 + cos^-1  3/4]`

= `cos(sin^-1  1/4) cos(cos^-1  3/4) - sin(sin^-1  1/4) sin(cos^-1  3/4)`

= `3/4 sqrt(1 - (1/4)^2) - 1/4 sqrt(1 - (3/4)^2`

= `3/4 sqrt(15)/4 - 1/4 sqrt(7)/4`

= `(3sqrt(15) - sqrt(7))/6`

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Chapter 2: Inverse Trigonometric Functions - Solved Examples [Page 23]

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NCERT Exemplar Mathematics Exemplar [English] Class 12
Chapter 2 Inverse Trigonometric Functions
Solved Examples | Q 12 | Page 23
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