Question 5 - CBSE Class 12 Sample Paper for 2018 Boards - Solutions of Sample Papers and Past Year Papers - for Class 12 Boards

Last updated at August 13, 2026 by

If 4sin −1 x + cos −1 x = 𝜋 then find the value of x.

This is a question of CBSE Sample Paper - Class 12 - 2017/18.

You can download the question paper here  https://www.teachoo.com/cbse/sample-papers/

If 4sin-1 x + cos-1 x = pi, then find value of x - Teachoo

Question 5 - CBSE Class 12 Sample Paper for 2018 Boards - Part 2

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Transcript

Question 5 If 4sin 1 x + cos 1 x = then find the value of x. 4sin 1 x + cos 1 x = We know that sin 1 x + cos 1 x = /2 cos 1 x = /2 "sin 1 x" 4sin 1 x + / "sin 1 x" = 4sin 1 x "sin 1 x" = /2 3sin 1 x = /2 sin 1 x = 1/3 /2 sin 1 x = /6 sin 1 x = /6 x = sin /6 x = sin (180 )/6 x = sin 30 x = /

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