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4 Trigonometry and Complex Numbers - Stanford University
radians) of the angle at the origin between the positive {-axis and the ray from the ori-gin through the point measured in the counterclockwise direction. The other four basic trigonometric functions can be de¿ned in terms of these two—namely, wdq{ @ vlq{frv{vhf{ @ 4 frv{frw{ @ frv
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