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`5tan^-1x+3cot^-1x=2x`

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Question

`5tan^-1x+3cot^-1x=2x`

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Solution

`5tan^-1x+3cot^-1x=2x`

⇒ `5tan^-1x+3(pi/2-tan^-1x)=2pi`     `[becausecot^-1x=pi/2-tan^-1x]`

⇒ `5tan^-1x+(3pi)/2-3tan^-1x=2pi`

⇒ `2tan^-1x=pi/2`

⇒ `tan^-1x=pi/4`

⇒ `x=tan  pi/4=1`

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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 10 | Page 66
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