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If `Cos^-1x + Cos^-1y =Pi/4,` Find the Value of `Sin^-1x+Sin^-1y`

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Question

If `cos^-1x + cos^-1y =pi/4,`  find the value of `sin^-1x+sin^-1y`

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Solution

`cos^-1x + cos^-1y =pi/4`

⇒ `pi/2-sin^-1x+pi/2-sin^-1y=pi/4`      `[thereforecos^-1x=pi/2-sin^-1x]`

⇒ `pi-(sin^-1x+sin^-1y)=pi/4`

⇒ `sin^-1x+sin^-1y=(3pi)/4`

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Chapter 3: Inverse Trigonometric Functions - Exercise 4.10 [Page 66]

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R.D. Sharma Mathematics Volume 1 and 2 [English] Class 12
Chapter 3 Inverse Trigonometric Functions
Exercise 4.10 | Q 2 | Page 66
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