Assuming the upper left corner is (0,0) and I'm given an angle of 30 degrees, a starting point of (0,300), a line length of 600, how do I calculate the ending point of the line so that the line is representative of the angle given. Assuming the upper left corner is (0,0) and I'm
阅读背景：
给定一个角度和长度，我如何计算坐标
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