Skip to main content
SV Siteview
Log in Create account
Home › Calculators › Trigonometry Calculators › Double & Half-Angle Identities

Double & Half-Angle Identities

Calculate trig values using double and half-angle formulas.
Input Values
°

Computes sin(2θ), cos(2θ), sin(θ/2), cos(θ/2) with full steps.

Unit Circle
0° 90° 180° 270° 225° ref: 45°
(cos θ, sin θ) shown on circle
Learn the concept
Trigonometric Identities
Learn the core trig identities — Pythagorean, reciprocal, and quotient — and use them to simplify expressions and verify equations without plugging in numbers.
Read lesson →

User Feedback & Ratings

0 / 5
Based on 0 ratings

Rate this calculator

☆ ☆ ☆ ☆ ☆

No feedback yet. Be the first to rate!