SSC CHSL 2020 PYQ — Question 65

SSC CHSL - 20th October 2020 - Shift 1 • Quantitative Aptitude • Q65

If √(3) Cosθ = Sinθ, then the value of (4 Sin2θ - 5 Cosθ)/(3 Cosθ + 1) is:

Show answer & explanation

Correct answer: B

Explanation

The correct answer is option 2 i.e 1 / 5

⇒ √(3) Cosθ = Sinθ

⇒ Tanθ = √3

⇒ θ = π / 3

⇒ (4 Sin2θ - 5 Cosθ)/(3 Cosθ + 1)

⇒ {4 × (3 / 4) - 5 × (1 / 2)}/{3 × (1 / 2) + 1}

⇒ {3 - 5 / 2}/{3 / 2 + 1}

⇒ {1 / 2}/{5 / 2}

⇒1/5