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11-07-2018
Mathematics

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nethp1020pbgwea nethp1020pbgwea

11-07-2018

Recall that cosA = x / r, where r is hypotenuse, and x is adjacent.

If you look at 45 degree on the unit circle, the value pair that corresponds is (sqrt(2)/2, sqrt(2)/2). Since cos only care about the x value, we take sqrt(2)/2 = 0.707.

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