t.Errorf("Tan(%g) = %g, want %g", vf[i]+large, f2, f1)
		}
	}
}

// Check that trigReduce matches the standard reduction results for input values
// below reduceThreshold.
func TestTrigReduce(t *testing.T) {
	inputs := make([]float64, len(vf))
	// all of the standard inputs
	copy(inputs, vf)
	// all of the large inputs
	large := float64(100000 * Pi)
	for _, v := range vf {