only define zero constant when it is used
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@ -22,7 +22,9 @@
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static const double ln2 = 6.93147180559945286227E-01;
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static const double two_pow_m28 = 3.7252902984619141E-09; /* 2**-28 */
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static const double two_pow_p28 = 268435456.0; /* 2**28 */
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#ifndef Py_NAN
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static const double zero = 0.0;
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#endif
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/* acosh(x)
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* Method :
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