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C programming/complex.h/catan
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Prototypes
double complex catan(double complex z);
float complex catanf(float complex z);
long double complex catanl(long double complex z);
Description
These functions compute and return the complex arc tangent value, in the range of a strip mathematically unbounded along the imaginary axis and in the interval [-π/2, +π/2] along the real axis.
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