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Proposition: Derivative of Tangent

The derivative of the tangent function $f(x)=\tan(x),$ $x\in\mathbb R,$ is given by $$\tan'(x)=\frac1{\cos^2(x)}.$$

Table of Contents

Proofs: 1

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References

Bibliography

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