Proposition: Pythagorean Identity

The following formula holds for all real numbers \(x\in\mathbb R\): \[\cos^2(x)+\sin^2(x)=1.\]

Proofs: 1

Examples: 1


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References

Bibliography

  1. Forster Otto: "Analysis 1, Differential- und Integralrechnung einer Veränderlichen", Vieweg Studium, 1983