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#include <complex.h> // for cexpf, cimagf, complex, crealf, I
#include <math.h> // for cosf, expf, sinf
float complex cexpf(float complex z)
{
float r, x, y;
x = crealf(z);
y = cimagf(z);
r = expf(x);
return r * cosf(y) + r * sinf(y) * I;
}
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