sec[arcsin(988/1037)],要用分?jǐn)?shù)值表示
- 教育綜合
- 2023-03-19 17:43:57
sec[arcsin(1012/1013)],要用幾分之幾的分?jǐn)?shù)值表示?
對邊=1012, 斜邊=1013 , =>鄰邊=√(1013^2-1012^2)=45 => arcsin(1012/1013)=arcsec(1013/45) sec[arcsin(1012/1013)] =sec[arcsec(1013/45)] =1013/45sec[arcsin(836/845)],要用幾分之幾的分?jǐn)?shù)值表示?
設(shè)a=arcsin(836/845) 則sina=836/845 cosa=√〔1-(sina)^2〕 =√〔1-(836/845)^2〕 =123/845 所以,sec〔arcsin(836/845)〕 =seca =1/(cosa) =1/(123/845) =845/123計(jì)算:sec[arcsin(837/845)],要用幾分之幾的分?jǐn)?shù)值表示?
=1/cos(arcsin(837/845))
=1/(116/845)
=845/116
計(jì)算:sec[arcsin(1196/1205)],要用幾分之幾的分?jǐn)?shù)值表示?
sec[arcsin(1196/1205)] 對邊=1196,斜邊=1205 ,鄰邊=√(1205^2-1196^2) =147 =sec[arcsec(1205/147)] =1205/147sec[arcsin(1100/1109)],要用幾分之幾的分?jǐn)?shù)值表示?
解如下圖所示
展開全文閱讀