The problem: sin(t) - cos(t) can be rewritten as ? - The answer is sqrt(2)cos(3PI/4 - t). there is an equation Re^(xt)cos(bt - angle). R = sqrt(A^2+B^2) So i get the following answer: sqrt(2)(cos(t - 3PI/4)). Why does the correct answer have the 3PI/4 switched with the t??