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

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