fn sub(a: &[FieldElement<F>; 3], b: &[FieldElement<F>; 3]) -> [FieldElement<F>; 3] {
        [&a[0] - &b[0], &a[1] - &b[1], &a[2] - &b[2]]
    }
Returns the component wise subtraction of `a` and `b`
crates/math/src/field/extensions/cubic.rs