Find the angle between the OA ray and the positive OX semiaxis, if A (-1; 3).
| December 6, 2020 | education
cosA = -1 * x + 3 * 0 / root (1 + 9) * root (x’2 + 0) = -x / xroot (10) = 1 / root (10) is approximately equal to 0.316 approximately equal to 108 degrees
answer: angle A 108 degrees
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