Question

What is the length of the vector
[5 cos theta, 5 sin theta]? If the vector [5,0] is rotated 36 degrees in the counter clockwise direction, what are the components of the resulting vector?
|[5 cos theta, 5 sin theta]|
= √(25cos^2Ø + 25sin^2Ø)
= √(25(cos^2Ø + sin^2Ø)
= 5 , (since cos^2Ø + sin^2Ø = 1)

Before I answer the next one, I have to know if you know about the rotation matrix .
A little, but confusing sometimes.

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