Proposition: Derivative of Cosine

The derivative of the cosine function $f(x)=\cos(x),$ $x\in\mathbb R,$ is $$f'(x)=-\sin(x).$$

Proofs: 1


Thank you to the contributors under CC BY-SA 4.0!

Github:
bookofproofs


References

Bibliography

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