Difference between revisions of "Derivative of tangent"
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| − | <strong>[[Derivative of tangent|Proposition]]:</strong> $\dfrac{d}{ | + | <strong>[[Derivative of tangent|Proposition]]:</strong> The following formula holds: |
| + | $$\dfrac{\mathrm{d}}{\mathrm{d}z} \tan(z) = \sec^2(z),$$ | ||
| + | where $\tan$ denotes the [[tangent]] function and $\sec$ denotes the [[secant]] function. | ||
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<strong>Proof:</strong> █ | <strong>Proof:</strong> █ | ||
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