SarkariPYQ

SSC CHSL 2025 PYQ — Question 75

SSC CHSL - 21 Nov 2025 - Shift 2 • Quantitative Aptitude • Q75

Back to paper

If cos2A=½, what is sin2A?

Show answer & explanation

Correct answer: A

Explanation

Given:

cos2A = 1/2

By the formula:

sin²θ + cos²θ = 1

sin²2A + (1/2)² = 1

sin²2A + 1/4 = 1

sin²2A = 3/4

sin2A = √(3/4)

= √3 / 2