ccoshf
float complex ccoshf(float complex);
return (ccoshf(CMPLXF(-cimagf(z), crealf(z))));
test_even_tol(ccoshf, z, CMPLXL(coshf(nums[i]), 0), FLT_ULP());
test_even_tol(ccoshf, z, CMPLXL(cosf(nums[i]),