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| revision 2496 by mahesh, Fri Dec 18 01:32:28 2009 UTC | revision 2497 by jpye, Wed Aug 17 09:34:25 2011 UTC | |
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| # | Line 288 double datan(register double d) | Line 288 double datan(register double d) |
| 288 | ||
| 289 | double datan2(register double d) | double datan2(register double d) |
| 290 | { | { |
| 291 | return -ldexp(d/(1.0+d*d),1); | return -2*d/sqr(1+d*d); |
| 292 | } | } |
| 293 | ||
| 294 | #ifdef HAVE_ERF | #ifdef HAVE_ERF |
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