Find ∫ (cos 2 ⁡ 2x - sin 2 ⁡ 2x) dx


  1. Class 12
  2. Solutions of Sample Papers and Past Year Papers - for Class 12 Boards


Question 18 (OR 2nd Question) Find ∫1 (cos2⁡ 2x - sin2⁡ 2x) dx We know that 𝑐𝑜𝑠⁡2𝑥=cos^2⁡𝑥−sin^2⁡𝑥 Therefore, 𝑐𝑜𝑠⁡4𝑥=cos^2⁡2𝑥−sin^2⁡2𝑥 So, our integration becomes ∫1 (cos^2⁡2𝑥−sin^2⁡2𝑥) dx = ∫1 cos⁡4𝑥 dx = 𝐬𝐢𝐧⁡𝟒𝒙/𝟒+𝑪

About the Author

Davneet Singh's photo - Teacher, Engineer, Marketer
Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.