Lesson 4 of 15Article22 min
Ch 3 — Trigonometric Functions
Trigonometric functions are defined for real numbers via the unit circle. Radian measure, allied angles, and graphs of sin, cos, tan are core NCERT skills.
Radians and circular functions
Trigonometric functions are defined for real numbers via the unit circle. Radian measure, allied angles, and graphs of sin, cos, tan are core NCERT skills.
- Memorise exact values for 0, π/6, π/4, π/3, π/2.
- Signs by quadrant (ASTC).
- Solve equations carefully with general solutions (+ 2nπ or + nπ).
Read this alongside the official NCERT chapter: Trigonometric Functions — https://ncert.nic.in/textbook.php?kemh1=3-16 (full book index: https://ncert.nic.in/textbook.php?kemh1=0-16).