Laser 128 - Page 244

MATHEMATICAL FUNCTIONS
Function Equivalent
In v er se hy perbolic sine ARCSINH(x)=LOG
(x+SQR(X :!< X+ 1))
In v er se hy perbolic cosine ARCCOSH (x) =LOG
(x+SQR(X! X+-1 ))
Inv erse hy perbolic tangent ARCTANH(x)=LOG
((I +x)/ (1-x))/ 2
Inverse hyperbolic secant ARCSECH(x)=LOG
(( 1+SQR(1-xu)) / x)
Inverse hy perbolic cosecant ARCCSCH(x)=LOG
(( 1 +SGN(x)•SGN(x)*SQR
(l+ux)) / x)
Inver se hyperbolic cotangent ARCCOTH(x)=LOG
((x+l) / (x-1))/ 2
If you use the se functions, a good way to code them
would be using the DEF FN statement. for example,
inste ad of typing the formula for in verse hyperbolic
sine each time you need it, you could use a program
line.
] 10 DEF FN INSIH(x) =LOG (x * x + 1)
, then ref er to it as
] 20 Z = FN INSIH(x)
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