Consider the vector v = (5,8).
Write v in the form (|v|cosθ|v|sinθ).
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We need to know the magnitude of v and the angle it makes with the x-axis.
To solve for magnitude:
For the angle it makes with the x axis:
`costheta=5/sqrt(89) -> theta=58`
Therefore, the vecotr in the form `(|v|costheta,|v|sintheta)` is:
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