EXCEL中怎么计算COS(211°59′21″-49°)怎么算

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EXCEL中怎么计算COS(211°59′21″-49°)怎么算EXCEL中怎么计算COS(211°59′21″-49°)怎么算EXCEL中怎么计算COS(211°59′21″-49°)怎么算思路:c

EXCEL中怎么计算COS(211°59′21″-49°)怎么算
EXCEL中怎么计算COS(211°59′21″-49°)怎么算

EXCEL中怎么计算COS(211°59′21″-49°)怎么算
思路:
cos(α-β)=cosα·cosβ+sinα·sinβ
cos(211°59′21″-49°)=cos211°59′21″*cos49°+sin211°59′21″*sin49°
=cos(211+59/10+21/3600)°*cos49°+sin(211+59/10+21/3600)°*sin49°
单元格输入公式如下:=cos(radians(211+59/10+21/3600))*cos(radians(49))+sin(radians(211+59/10+21/3600))*sin(radians(49))
结果:
=-0.977804573