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三角函数公式\n\n![triangle.jpg](images/triangle.jpg)\n\n基本函数|英文|缩写|表达式|语言描述|\n|------|--------|-----|-------|----|\n正弦函数|sine|sin|a/c|∠A的对边比斜边|\n余弦函数|cosine|cos|b/c|∠A的邻边比斜边|\n正切函数|tangent|tan|a/b|∠A的对边比邻边|\n余切函数|cotangent|cot|b/a|∠A的邻边比对边|\n正割函数|secant|sec|c/b|∠A的斜边比邻边|\n余割函数|cosecant|csc|c/a|∠A的斜边比对边|\n\n\n### 一份400x600，定位圆心坐标为(200,300),半径为60的黄金圆坐标点，逆时针坐标\n|起点坐标|终点坐标\n|---|---|\n|(200, 360)|529, 179|\n|(230, 351)|(529, 179)|\n|(251,330)|(409, 57)|\n|(260, 300)|(260, 17)|\n|(251, 270)|(126, 52)|\n|(230, 248)|(39, 138)|\n|(200, 240)|(11, 240)|\n|(170, 248)|(33, 326)|\n|(148, 270)|(85, 378)|\n|(140, 300)|(140, 394)|\n|(148, 330)|(179, 384)|\n|(170, 351)|(197, 367)|\n\n### 常见角度关系\nsin比cos 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