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並前往https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:vectors/x9e81a4f98389efdf:magnitude-direction/v/angles-of-vectors-from-components

Direction of vectors from components: 1st & 2nd quadrants

Sal first finds the direction angle of a vector in the first quadrant, then moves onto a trickier one in the second quadrant. Questions Tips & Thanks ...

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