MathLivePythagorean trigonometric identity
The squared sine and squared cosine of any angle always add up to one, a consequence of the Pythagorean theorem applied to the unit circle. It is used to simplify trigonometric expressions and solve trigonometric equations.
\sin^2\theta + \cos^2\theta = 1What the symbols mean
| angle (in radians or degrees) |
About this formula
- FieldMathematics
- TopicTrigonometry
- LevelHigh school
- Also calledPythagorean identity, first trigonometric identity, sin squared plus cos squared, trig identity sin cos 1
- SourceWikidata Q2039117
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