But that's not right, because if we were to add parentheses, this is what this is implying. So you can't just take the 14 x plus four and multiply it by this, and assuming you're taking the cosine of the whole thing. So this is where Nejoman makes the mistake. The work is not correct, and the mistake is trying to multiply these two expressions and taking the cosine of the whole thing. Let's do one more of these. I find these strangely fun. All right, this one is involved.