Other Trigonometric functions

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17 Other Trigonometric functions

17.1 sgd - Gudermannian function $gd(x)$
17.2 sagd - Inverse Gudermannian function $gd-1(x)$
17.3 scrd - Chord $crd(x)$
17.4 sacrd - Inverse Chord $crd-1(x)$

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