Trigonometric Identity Checker
Check trigonometric equations, compare both sides, and explore their graphs visually.
=
Use x for the angle, pi for π, ^ for powers, * for multiplication, and / for division. Example: sin(x)^2.
Graph Visualisation
Compare how the two expressions change over the selected range. The vertical axis is limited to keep the graph readable.
Left-hand side
Right-hand side
Curve breaks can indicate undefined values or values outside the visible graph range.
Try a Common Identity
How to Use the Checker
- Choose a predefined identity or select Custom Equation.
- Enter the expressions on both sides of the equation.
- Select the correct angle unit and test range.
- Click Check Identity to view the results and graph.
- Review any mismatches or skipped angles.
This tool checks numerical values at selected angles. Matching values do not constitute a formal proof of an identity.
