This is an important question from the
Book- ML Aggarwal
Chapter- Trigonometric Identities
If 7 sin2 θ + 3 cos2 θ = 4, 0° ≤ θ ≤ 90°, then find the value of θ
Trigonometric Identities, class 10th, chapter 18th, question no32 , ICSE board, ML aggarwal..