cot[arcsec(2117/195)],怎么解答? sinx与arcsinx的转化
更新时间:2022-01-03 10:31:05 • 作者:JEROME •阅读 181
COS(195度)的三角函数值怎么求?(要详细过程)
解答:
cos195°
=cos(180°+15°)
=-cos15°
=-cos(45°-30°)
=-(cos45°cos30°+sin45°sin30°)
=-[(√2/2)*(√3/2)+(√2/2)*(1/2)]
=-(√6+√2)/4