sin47°等于多少

羿砍仪2047sin47°12'等于多少,精确到0.0001
丁使贪17044458405 ______ 0.7337

羿砍仪2047在一个直角三角形中 cos47度 等于多少 -
丁使贪17044458405 ______[答案] cos47度 ==0.682

羿砍仪2047sin47π/6 的值? -
丁使贪17044458405 ______ sin47π/6 = sin(48-1)π/6= sin(8π-1/6π)= sin(-1/6π)=-1/2

羿砍仪2047sin17度sin43度+sin73度sin313度=多少?求详解,谢谢! -
丁使贪17044458405 ______[答案] sin17°sin43°+sin73°sin313° =sin17°sin43°-sin73°sin47° =cos73°cos47°-sin73°sin47° =cos(73°+47°) =cos(120°) =-1/2

羿砍仪2047sin47.5度等于多少? -
丁使贪17044458405 ______ sin47.5° = 0.737 希望帮到你 望采纳 谢谢 加油

羿砍仪2047求 - sin167°sin223°+sin257°sin313°的值 -
丁使贪17044458405 ______[答案] 原式 =-sin(180°-13°)sin(270°-47°)+sin(270°-13°)sin(360°-47°) =-sin13°(-cos47°)-cos13°(-sin47°) =sin13°cos47°+cos13°sin47° =sin(13°+47°) =sin60° =√3/2

羿砍仪2047已知角的终边过点(sin47°, cos 47°)求sin(a - 13°) -
丁使贪17044458405 ______ 相当于过边(cos43°,sin43°),α=43° sin(α-13°)=sin30°=1/2

羿砍仪20471/(sin45°sin46°)+1/(sin45°sin46°)+……+1/(sin89°sin90°)=? -
丁使贪17044458405 ______[答案] 1/(sin45°sin46°)=(cos45°/sin45°-cos46°/sin46°)/sin1° 然后就可以裂项相消了,最后是 1/sin1

羿砍仪2047cos17度sin43度+sin163度sin47度 -
丁使贪17044458405 ______[答案] sin17°·cos43°+ sin73°·cos47° = sin17°·cos43°+ cos(90°-73°)·sin(90°-47°) = sin17°·cos43°+ cos17°·sin43° = sin(17°+ 43°) = sin60° = √3/2

羿砍仪2047sin47° - sin17°cos30°/sin73°化简求值 -
丁使贪17044458405 ______[答案] (sin47°-sin17°cos30°)/sin73° =[sin(30°+17°)-sin17°cos30°]/cos17° =(sin30°cos17°+sin17°cos30°-sin17°cos30°)/cos17° =sin30°cos17°/cos17° =sin30° =1/2