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Class X Mathematics

Chapter 8: Introduction to Trigonometry

Standard NCERT & CBSE aligned study curriculum. Master concepts, track accuracy, revise weak areas, and challenge yourself with 9 customized practice modes.

Example 1

Trigonometric Identity proof

If sin(A) = 3/5, find cos(A) for acute angle A.
sin θcos θθ

Calculation Steps:

  1. 1Use identity: sin²A + cos²A = 1.
  2. 2Substitute: (3/5)² + cos²A = 1 => 9/25 + cos²A = 1.
  3. 3Subtract: cos²A = 1 - 9/25 = 16/25.
  4. 4Take square root: cos(A) = 4/5.
Solution4/5