if x.Equal(expected) != 1 {
		t.Errorf("%+v != %+v", x, expected)
	}
	x.Add(y, m)
	expected = &Nat{[]uint{7}}
	if x.Equal(expected) != 1 {
		t.Errorf("%+v != %+v", x, expected)
	}
}

func TestExp(t *testing.T) {
	m := modulusFromBytes([]byte{13})
	x := &Nat{[]uint{3}}
	out := &Nat{[]uint{0}}
	out.Exp(x, []byte{12}, m)
	expected := &Nat{[]uint{1}}
	if out.Equal(expected) != 1 {

			continue
		}
		// Cosh(-z)  == Cosh(z)
		if f := Cosh(-v.in); !cAlike(v.want, f) && !cAlike(v.in, -v.in) {
			t.Errorf("Cosh(%g) = %g, want %g", -v.in, f, v.want)
		}
	}
}
func TestExp(t *testing.T) {
	for i := 0; i < len(vc); i++ {
		if f := Exp(vc[i]); !cSoclose(exp[i], f, 1e-15) {
			t.Errorf("Exp(%g) = %g, want %g", vc[i], f, exp[i])
		}
	}
	for _, v := range expSC {