This question already has an answer here:
I am a little bit confused what $$|-\sin t + \cos t|$$ is.
I heard that is $1$ but I thought $\sin t + \cos t$ was $1$.
Is it just that the progression of $t$ is reversed and the size stays the same?
What if the absolute sign is removed? Does it still stay $1$?
----edit---- Well, they are vectors and the question is asking about the length of the vector. So the length is 1 no matter what the signs are.