SSC CGL 2021 PYQ — Question 74

SSC CGL - 13 Aug 2021 - Shift 3 • Quantitative Aptitude • Q74

If 3 tan θ\theta = 2 3\sqrt{3} sin θ\theta, 0º < θ\thetaº < 90º, then find the value of 2sin2 2θ\theta - 3cos2 - 3θ\theta

Show answer & explanation

Correct answer: C

Explanation

The correct answer is option 3 i.e. 32\frac{3}{2}

⇒  3 tan θ\theta = 2 3\sqrt{3} sin θ\theta

⇒ Sinθ/Cosθ = 2Sinθ/√3

⇒ Cosθ = √3/2

⇒ θ = 30o

⇒  2sin2 2θ\theta - 3cos2 - 3θ\theta

⇒ 2Sin2 60o - 3Cos2 90o

⇒ 2(√3/2)2 - 0

⇒ 3/2