Trigonometry is one of the most vital chapters in NDA Paper 1, contributing about 15 to 20 questions (approx. 37.5 to 50 marks) either directly or indirectly through Calculus and Coordinate Geometry.

Below is a preview of 5 actual exam-style Trigonometry questions. Review the formulas, study the detailed solutions, and test your current capability.

Important Formulas & Concepts

  • Compound Angle: $\sin(A \pm B) = \sin A\cos B \pm \cos A\sin B$
  • Double Angle: $\cos 2A = \cos^2 A - \sin^2 A = 2\cos^2 A - 1 = 1 - 2\sin^2 A$
  • Product to Sum: $2\sin A\cos B = \sin(A+B) + \sin(A-B)$