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the terminal side of an angle in standard position coincides with the line x-2y=0, what is the cosine to the nearest ten-thousandth??? I am completely lost with this one

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x-2y = 0.
2y = x.
y = (1/2)x.

Slope = 1/2 = Tan A.
A = 26.57o.

Cos 26.57 = 0.89443.

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