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sin8度

sin8度、cos8度、tan8度就是8度角的正弦,余弦,正切。

(sin7+cos15sin8)/(cos7-sin15sin8) =[sin7+cos(7+8)sin8]/[cos7-sin(7+8)sin8] =[sin7+(cos7cos8-sin7sin8)sin8]/[cos7-(sin7cos8+sin8cos7)sin8] =(sin7+cos7cos8sin8-sin7sin8)/(cos7-sin7sin8cos8-sin8cos7) =(sin7-sin7sin8+cos7cos8sin8)/...

sin(8) = 0.98935824662338

8度8分=8.133度 sin8.133゜=0.1415

题干模糊不清

(sin7°+cos15°sin8°)/(cos7°-sin15°sin8°)这里把7°=15°-8°表示.sin7°=sin(15°-8°)=sin15°cos8°-cos15°sin8°cos7°=cos(15°-8°)=cos15°cos8°+sin15°sin8°则上式=sin15°cos8°÷(cos15°cos8°) =sin15°/cos15°=2sin15°cos15°/(2cos15°×cos15°)=sin30°/...

0.14是数值

(sin7+cos15sin8)/(cos7-sin15sin8) =(sin(15-8)+cos15sin8)/(cos(15-8)-sin15sin8) =(sin15cos8-cos15sin8+cos15sin8)/(cos15cos8+sin15sin8-sin15sin8) =sin15cos8/cos15cos8 =sin15/cos15 =2sin15cos15/2cos²15 =sin30/(1+cos30) =2-√3

sin8/兀等于多少 应该是: sin8分之π吧 sin8分之π =[√(2-√2)]/2

给你举个例子:cos12度×cos98度-sin12度×cos8度=-cos12°×sin8°-sin12°×cos8° =-sin(12°+8°) = -sin20

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