Hyperbolic trigonometric functions

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`sinh(x)=(e^x-e^(-x))/2`

`cosh(x)=(e^x+e^(-x))/2`

`tanh(x)=(e^x-e^(-x))/(e^x+e^(-x))=(sinh(x))/(cosh(x))`

`"sech"(x)=2/(e^x+e^(-x))=1/(cosh(x))`

`"csch"(x)=2/(e^x-e^(-x))=1/(sinh(x))`

`"coth"(x)=(e^x+e^(-x))/(e^x-e^(-x))=(cosh(x))/(sinh(x))=1/tanh(x)`

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