需要0,15,30,45,60,90,120,135,150,180,210,225,270,360的特殊角的三角函数要tan,cos,sin不要近似值
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需要0,15,30,45,60,90,120,135,150,180,210,225,270,360的特殊角的三角函数要tan,cos,sin不要近似值
需要0,15,30,45,60,90,120,135,150,180,210,225,270,360的特殊角的三角函数要tan,cos,sin不要近似值
需要0,15,30,45,60,90,120,135,150,180,210,225,270,360的特殊角的三角函数要tan,cos,sin不要近似值
sin 0=0;cos0=1;tan 0=0;
sin15=(√6-√2)/4,cos15=(√6+√2)/4,tan15=(2 - √3)
sin30=1/2,cos30=√3/2,tan30=√3/3
写不下,参考:
http://zhidao.baidu.com/question/207437693.html?an=0&si=6