52 lines
745 B
CoffeeScript
52 lines
745 B
CoffeeScript
### cosh =====================================================================
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Tags
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----
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scripting, JS, internal, treenode, general concept
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Parameters
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----------
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x
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General description
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-------------------
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Returns the hyperbolic cosine of x
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```
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exp(x) + exp(-x)
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cosh(x) = ----------------
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2
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```
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###
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Eval_cosh = ->
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push(cadr(p1))
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Eval()
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ycosh()
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ycosh = ->
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save()
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yycosh()
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restore()
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yycosh = ->
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d = 0.0
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p1 = pop()
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if (car(p1) == symbol(ARCCOSH))
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push(cadr(p1))
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return
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if (isdouble(p1))
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d = Math.cosh(p1.d)
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if (Math.abs(d) < 1e-10)
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d = 0.0
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push_double(d)
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return
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if (isZeroAtomOrTensor(p1))
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push(one)
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return
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push_symbol(COSH)
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push(p1)
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list(2)
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