cos15度等于几分之几
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cos15度等于几分之几
cos15度等于几分之几
cos15度等于几分之几
cos15度=cos(45度-30度)=cos45度cos30度+sin45度sin30度=根号2/2*根号3/2+根号2/2*1/2=(根号6+根号2)/4.
cos15°=cos(45°-30°)=cos45°cos30°+sin45°sin30°=根号6/4+根号2/4
cos15度等于几分之几
sin15.30.45.60.75.90.105.120.135.150.165.180 cos15…90… ten15.30…各等于几分之几.帮个忙!
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