sin55的知識大全

sin55度等於(3√6+4√2)/2，計算過程如下：sin55°=sin(90°-35°)=sin90°cos35°-cos90°sin35°=cos35°=cos3(15°)=4cos³(15°)-3cos15°=4*(√6/4+√2/4)³+3*(√6/4+√2/4)=(3√6+4√2)/2。...