sin73°等于多少

文岭晓4828帮我计算两道题目.sin73°32≈? cos83°15≈? 在线等! -
人支质17848855555 ______ sin73°32≈0.957

文岭晓4828sin17度sin43度+sin73度sin313度=多少? -
人支质17848855555 ______ sin17°抄sin43°zhidao+sin73°sin313°=sin17°sin43°-sin73°sin47°=cos73°cos47°-sin73°sin47°=cos(73°+47°)=cos(120°)=-1/2

文岭晓4828sin0°sin90°sin180°sin270°sin360°等于多少 -
人支质17848855555 ______ sin0°=0,sin90°=1,sin180°=0,sin270°=-1,sin360°=0.

文岭晓4828sin17度cos47度—sin73度sin47度=多少
人支质17848855555 ______ sin73=cos17 sin17cos47-cos17sin47=sin(17-47)=-1/2

文岭晓4828高一数学 sin47° - sin17°cos30°/sin73°化简求值 -
人支质17848855555 ______ (sin47°-sin17°cos30°)/sin73° =[sin(30°+17°)-sin17°cos30°]/cos17° =(sin30°cos17°+sin17°cos30°-sin17°cos30°)/cos17° =sin30°cos17°/cos17° =sin30° =1/2

文岭晓4828sin163°sin 223°+sin 253°sin 313° 等于?? -
人支质17848855555 ______ 补充:sin163°=sin(180°-17°)=sin17° sin223°=sin(180°+43°)=-sin43° sin253°=sin(180°+73°)=-sin73° sin313°=sin(360°-47°)=-sin47° sin73°=cos17° 互为余角 上面是诱导公式

文岭晓4828sin47° - sin17°cos30°/sin73°化简求值 -
人支质17848855555 ______[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

文岭晓4828sin73°cos13° - cos73°sin13°等于( )A. - 12B.12C. - 32D.3 -
人支质17848855555 ______ sin73°cos13°-cos73°sin13° =sin(73°13°)=sin60°= 3 2 故选:D

文岭晓4828sin17度*cos43度+sin73度*cos47度= 帮我把公式写出来? -
人支质17848855555 ______[答案] sin17°·cos43°+ sin73°·cos47° = sin17°·cos43°+ cos(90°-73°)·sin(90°-47°) = sin17°·cos43°+ cos17°·sin43° = sin(17°+ 43°) = sin60° = √3/2

文岭晓4828sin17°cos227°+sin73°sin47°等于( )A. - 12B.12C. - 32D.3 -
人支质17848855555 ______ ∵cos227°=cos(180°+47°)=-cos47°sin73°=sin(90°-17°)=cos17°∴sin17°cos227°+sin73°sin47°=sin47°cos17°-cos47°sin17°=sin(47°-17°)=sin30°=1 2 故选:B