freebsd-dev/contrib/libf2c/libF77/c_cos.c

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#include "f2c.h"
#ifdef KR_headers
extern double sin(), cos(), sinh(), cosh();
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VOID c_cos(r, z) complex *r, *z;
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#else
#undef abs
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#include "math.h"
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void c_cos(complex *r, complex *z)
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#endif
{
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double zi = z->i, zr = z->r;
r->r = cos(zr) * cosh(zi);
r->i = - sin(zr) * sinh(zi);
}