| 1 | ### cosh =====================================================================
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| 2 |
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| 3 | Tags
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| 4 | ----
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| 5 | scripting, JS, internal, treenode, general concept
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| 6 |
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| 7 | Parameters
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| 8 | ----------
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| 9 | x
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| 10 |
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| 11 | General description
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| 12 | -------------------
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| 13 | Returns the hyperbolic cosine of x
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| 14 |
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| 15 | ```
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| 16 | exp(x) + exp(-x)
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| 17 | cosh(x) = ----------------
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| 18 | 2
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| 19 | ```
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| 20 |
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| 21 | ###
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| 22 |
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| 23 | Eval_cosh = ->
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| 24 | push(cadr(p1))
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| 25 | Eval()
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| 26 | ycosh()
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| 27 |
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| 28 | ycosh = ->
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| 29 | save()
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| 30 | yycosh()
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| 31 | restore()
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| 32 |
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| 33 | yycosh = ->
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| 34 | d = 0.0
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| 35 | p1 = pop()
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| 36 | if (car(p1) == symbol(ARCCOSH))
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| 37 | push(cadr(p1))
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| 38 | return
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| 39 | if (isdouble(p1))
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| 40 | d = Math.cosh(p1.d)
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| 41 | if (Math.abs(d) < 1e-10)
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| 42 | d = 0.0
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| 43 | push_double(d)
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| 44 | return
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| 45 | if (iszero(p1))
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| 46 | push(one)
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| 47 | return
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| 48 | push_symbol(COSH)
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| 49 | push(p1)
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| 50 | list(2)
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| 51 |
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