cos兀/12等于多少
cos十二分之派等于多少 -
cos(π/12)=(√6+√2)/4。解答过程如下：cos(π/12)（π/12=15°=45°-3°）cos(π/3-π/4)=cosπ/3*cosπ/4+sinπ/4*sinπ/3 =(√6+√2)/4
cos(π/12)等于(√6+√2)/4。解答过程如下：其中，π/12=15°=45°-30°=π/3-π/4，而cos(π/12)=cos(π/3-π/4)=cos(π/3)cos(π/4)+sin(π/4)sin(π/3)=1/2)*(√2/2)+(√3/2)*(√2/2)=(√2/4)(1+√3)=(√6+√2)/4。cos12分之兀等于多少cos是三角希望你能满意。
cos(π/12)=(√6+√2)/4。解答过程如下：cos(π/12)（π/12=15°=45°-3°）cos(π/3-π/4)=cosπ/3*cosπ/4+sinπ/4*sinπ/3 =(√6+√2)/4
cos(π/12)等于(√6+√2)/4。解答过程如下：其中，π/12=15°=45°-30°=π/3-π/4，而cos(π/12)=cos(π/3-π/4)=cos(π/3)cos(π/4)+sin(π/4)sin(π/3)=1/2)*(√2/2)+(√3/2)*(√2/2)=(√2/4)(1+√3)=(√6+√2)/4。cos12分之兀等于多少cos是三角希望你能满意。
cos(π/12)=cos(π/3-π/4).=cos(π/3)*cos(π/4)+sin(π/3)sin(π/4).=(1/2)*(√2/2)+(√3/2)*(√2/2).=(√2/4)(1+√3).
π／12=180/12=15度cosπ／12=cos15
...求下列三角函数值求sin105度 cos12分兀 tan(-12分之7兀) -
/4。cosπ/12=cos15°=cos(45°-30°)=cos45°cos30°+sin45°sin30° =√2/2*√3/2+√2/2*1/2 =(√6+√2)/4，tan(-7π/12)=tan(-105°)=-tan(45°+60°)=-(tan45°+tan60)/[1-tan45°tan60°]=-(1+√3)/(1-√3)=-(1+√3)^2/2 =-2-√3。
解由cos15°=cos(45°-30°)=√2/2cos30°+√2/2sin30° =(√6+√2)/4 故cosπ/12cosπ/6 =cos15°cos30° =(√6+√2)/4×√3/2 =(3√2+√6)/8
sin的12分之兀乘cos的12分之兀是多少 -
回答：sinπ/12*cosπ/12 =1/2*sinπ/6 =1/2*1/2 =1/4
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cos1/2兀是多少? -
如果你问的是cos 二分之派，cos(pi/2)=0.如果问的是cos(1/2pi)，那么建议用计算器求解。
解如下图所示，