初中数学升学复习测试题精编──解三角形（一）一、填空题１．角α的顶点在坐标原点，始边与ｘ轴的正向重合，终边经过（－４，３），则ｃｔｇ（９０°－α）＝２．已知角α的顶点在坐标原点，始边与ｘ轴的正向重合，Ｐ是终边上的一个点（０°＜α＜１８０°），若则点Ｐ... Junior high school mathematics review review test editing ─ ─ solution triangle (a) a fill in the blank questions The vertex of the angle α is at the origin of the coordinate. The starting edge coincides with the positive direction of the x-axis, and the terminal edge passes (-4, 3). Then ctg(90°-α)=2. The vertex of the known angle α is at the origin of the coordinate. The starting edge coincides with the positive direction of the x-axis. P is a point on the terminal edge (0°<α<180°). If the point P...