sin7°cos37°-sin83°cos307° 求过程!
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sin7°cos37°-sin83°cos307° 求过程!
sin7°cos37°-sin83°cos307° 求过程!
sin7°cos37°-sin83°cos307° 求过程!
sin7°cos37°-sin83°cos307°
=sin7°cos37°-sin(90°-7°)cos(270°+37°)
=sin7°cos37°-cos7°sin37°
=sin(7°-37°)
=sin(- 30°)
= - 2分之1
cos37=4/5,这知道吧,sin7=sin(37-30),-sin(83)=-sin(90-7),再知道怎么做了吧
sin7°cos37°-sin83°cos307°=
sin7°cos37°-sin83°cos307° 求过程!
sin7°cos37°—sin83°cos53°的值是?谢谢
sin7°cos37°-sin83°sin37°的值是多少?3Q
sin7°cos37°-sin83°cos307°化简求值 求详细过程
sin37°cos83°+cos37°sin83°
sin37ºsin7º+cos37ºsin83º=
为什么sin83°=cos7°
sin7°27′是多少
cos37°=?
求cos8°-sin7°×sin15°分之sin8°+sin7°cos15°的值
(Sin7°+cos15°sin8°)÷(cos7°-sin15°sin8°)=?(sin7+cos15sin8)/(cos7-sin15sin8) 积化和差 =[sin7+(sin23-sin7)*0.5]/[cos7+(cos23-cos7)*0.5] =(0.5sin7+0.5cos23)/(0.5cos7+0.5cos23) 约分,和差化积 =(sin15*sin8)/(cos15*cos8) 约分 =tan15 半
cos83°·cos23°+sin83°·sin23°=
cos37° 等于cos多少π
cos7°cos23°-sin7°sin23°=?
sin7°3′7〃的值
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