Learn

Saturday, 31 October

JEE Main 2021 · MathsMultiple choiceSingle correctHardMulti-step

JEE Main 25 February 2021, Shift 1, Maths Q67

Question 67 of 90 in this shift, Maths question 7 of 30, Section A.

The value of the integral ∫sin⁡θ.sin⁡2θ (sin⁡6θ+sin⁡4θ+sin⁡2θ)2sin⁡4θ+3sin⁡2θ+61−cos⁡2θ dθ\int \frac{\sin\theta . \sin 2\theta\ (\sin^6\theta + \sin^4\theta + \sin^2\theta)\sqrt{2\sin^4\theta + 3\sin^2\theta + 6}}{1 - \cos 2\theta}\, d\theta is : (where c is a constant of integration)
  1. (1)118[9−2sin⁡6θ−3sin⁡4θ−6sin⁡2θ]32+c\frac{1}{18}\left[9 - 2\sin^6\theta - 3\sin^4\theta - 6\sin^2\theta\right]^{\frac{3}{2}} + c
  2. (2)118[9−2cos⁡6θ−3cos⁡4θ−6cos⁡2θ]32+c\frac{1}{18}\left[9 - 2\cos^6\theta - 3\cos^4\theta - 6\cos^2\theta\right]^{\frac{3}{2}} + c
  3. (3)118[11−18sin⁡2θ+9sin⁡4θ−2sin⁡6θ]32+c\frac{1}{18}\left[11 - 18\sin^2\theta + 9\sin^4\theta - 2\sin^6\theta\right]^{\frac{3}{2}} + c
  4. (4)118[11−18cos⁡2θ+9cos⁡4θ−2cos⁡6θ]32+c\frac{1}{18}\left[11 - 18\cos^2\theta + 9\cos^4\theta - 2\cos^6\theta\right]^{\frac{3}{2}} + cOfficial answer

Official answer

Option 4

NTA final key.

Chapter
Integrals