Question 7 - CBSE Class 12 Sample Paper for 2019 Boards

Last updated at Dec. 4, 2018 by Teachoo

Question 7

Find: ∫ (x ² + sin ² ⁡x) sec ² ⁡x / (1 + x ² ) dx

Transcript

Question 7 Find: ∫1▒((𝑥^2 + sin^2⁡𝑥 ) sec^2⁡𝑥)/(1 + 𝑥^2 ) dx ∫1▒((𝑥^2 + sin^2⁡𝑥 ) sec^2⁡𝑥)/(1 + 𝑥^2 ) dx = ∫1▒((𝑥^2 + sin^2⁡𝑥 )(1/cos^2⁡𝑥 ) )/(1 + 𝑥^2 ) dx = ∫1▒((𝑥^2 + sin^2⁡𝑥 ) )/((1 + 𝑥^2 ) cos^2⁡𝑥 ) dx Writing sin2 x = 1 – cos2 x = ∫1▒((𝑥^2 + 1 − cos^2⁡𝑥 ) )/((1 + 𝑥^2 ) cos^2⁡𝑥 ) dx = ∫1▒((1 + 𝑥^2 ) − cos^2⁡𝑥 )/((1 + 𝑥^2 ) cos^2⁡𝑥 ) dx = ∫1▒((1 + 𝑥^2 ) )/((1 + 𝑥^2 ) cos^2⁡𝑥 ) dx – ∫1▒(cos^2⁡𝑥 )/((1 + 𝑥^2 ) cos^2⁡𝑥 ) dx = ∫1▒1/cos^2⁡𝑥 dx – ∫1▒(1 )/((1 + 𝑥^2 ) ) dx = ∫1▒〖𝑠𝑒𝑐〗^2⁡𝑥 dx – ∫1▒(1 )/((1 + 𝑥^2 ) ) dx = 𝒕𝒂𝒏 𝒙−〖𝒕𝒂𝒏〗^(−𝟏) 𝒙 + C

CBSE Class 12 Sample Paper for 2019 Boards

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Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.