Recall the values of the trigonometric functions at the required angles:
So, the number -4 can be thought of as
Answer:
Step-by-step explanation:
The magnitude of a vector is the length of the vector itself.
Given a bi-dimensional vector, the magnitude of the vector is given by:
where
is the x-component of the vector
is the y-component of the vector
The vector in this problem is
Therefore its components are
And so, the magnitude of the vector is: