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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)/...

8度8分=8.133度 sin8.133゜=0.1415

0.14是数值

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°/...

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

sin22度+cos30度sin8度/cos22度-sin30度sin8度 分子=sin(30°-8°)+cos30°sin8° =sin30°cos8°-cos30°sin8°+cos30°sin8° =sin30°cos8° 分母=cos(30°-8°)-sin30°sin8° =cos°cos8°+sin30°sin8°-sin30°sin8° =cos30°cos8° 所求=sin30°/cos30°=tan30°...

cos6=cos(2008-2002)=cos2002*cos2008+sin2002*sin2008 sin6=sin(2008-2002)=sin2008*cos2002-sin2002*cos2008 (sin2002*sin2008-cos6)/(sin2002*cos2008+sin6) =(-cos2002*cos2008)/(sin2008*cos2002) =-cot2008 希望能帮助你

sin34.8=sin30*cos4.8+cos30sin4.8 因为sin30=0.5,cos30=0.866 求sin4.8 4.8度转化成弧度0.083775 由泰勒展开式sinx=x-(x^3)/3!+(x^5)/5!=0.083775-0.083775^3/6+0.083775^5/5!=0.083677 cosx=(1-0.083677^2)^0.5=0.99649 sin34.8=0.5*0.99649+0...

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