cos12.5°等于多少
cos12.5度等于多少啊 -
cos12.5度=0.976296007
cos12°30‘cos12.5°=0.976296 亲，请【采纳答案】，您的采纳是我答题的动力，谢谢。
cos12.5度=0.976296007
cos12°30‘cos12.5°=0.976296 亲，请【采纳答案】，您的采纳是我答题的动力，谢谢。
cos12°30‘cos12.5°=0.976296 亲，请【采纳答案】，您的采纳是我答题的动力，谢谢。
10*cos12.5°=9.76296
cos172°大概等于多少,用根号表示 -
-0.9903解析：cos172°=cos(180°-172°)=-cos8°≈-0.9903～～～cos8°(12.5°-4.5°)=cos12.5°cos4.5°+sin12.5°sin4.5°可用√表示出cos8°的精确值了，
1°＝π/180 弧度所以，-12.5°＝12.5*π/180＝5π/72弧度cos（59π/11）＝cos(59π/11)＝cos(5π 4π/11)＝-cos(4π/11)
(cos75°-sin10°)°等于多少 -
cos75°-sin10° = sin15°-sin10° =2sin12.5°cos2.5°.
将原图作如下变换，使B、C重合，且AB⊥CD，如图易得AD=10cm，为圆直径易得S△ABE=S△ABO，S△BDF'=S△BDO(同底等高)则S△ABE+S△BDF'=S△ABD 故阴影部分面积等于半圆面积，即选C 12.5π cm²
求解:—12.5°=多少弧度?解题越详细越好 还有第二个cos( —59π/11...
1°＝π/180 弧度所以，12.5°＝12.5*π/180＝5π/72弧度cos（59π/11）＝cos(59π/11)＝cos(5π 4π/11)＝-cos(4π/11)
cos80cos35+cos10cos55=sin10cos35+cos10sin35=sin45=根号2/2 cos=cos45 =√2/2 =0.70710678118654752440084436210485 cos80 =sin10 ，