作业帮cos(pai/15)×cos(2pai/15)×cos(3pai/15)×cos(4pai/15)×cos(5pai/15)×cos(6pai/15)×cos(7pai/15)求值
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cos(pai/15)×cos(2pai/15)×cos(3pai/15)×cos(4pai/15)×cos(5pai/15)×cos(6pai/15)×cos(7pai/15)求值
cos(pai/15)×cos(2pai/15)×cos(3pai/15)×cos(4pai/15)×cos(5pai/15)×cos(6pai/15)×cos(7pai/15)求值
cos(pai/15)×cos(2pai/15)×cos(3pai/15)×cos(4pai/15)×cos(5pai/15)×cos(6pai/15)×cos(7pai/15)求值
原式=[1/(sinπ/15)]•[sin(π/15)cos(π/15)cos(2π/15)．．cos(7π/15)]
=[sin(8π/15)/8sin(π/15)]•[cos(3π/15)cos(5π/15)cos(6π/15)cos(7π/15)]
=．．．
=[sin(4π/5)/2^7sin(π/5)]
=1/128
字数限制
负根号3/64
cos(pai/15)×cos(2pai/15)×cos(3pai/15)×cos(4pai/15)×cos(5pai/15)×cos(6pai/15)×cos(7pai/15)求值
cos(pai/15)×cos(2pai/15)×cos(3pai/15)×cos(4pai/15)×cos(5pai/15)×cos(6pai/15)×cos(7pai/15)求值
求值Cos pai/17 *cos 2pai/17*cos 4pai/17*cos 8pai/17
求值:cos(2pai/7)+cos(4pai/7)+cos(6pai/7)pai打不出,不好意思
sin(pai-a)cos(2pai-a)tan(-a+pai)/-tan(-a-pai)sin(-pai-a)
sin(a-3pai)cos(pai-a) / cos(pai/2 - a)cos(pai+a)sin(pai/2 + a)
化简:[sin(a+2pai)cos(pai+a)]/[sin(-pai-a)cos(-pai-a)]
化简：sin(2pai-a)cos(pai a)/cos(pai-a)sin(3pai-a)
sin^2(a+pai)-cos(pai+a)*cos(-a)+1
COS(PAI/5)COS(2PAI/5)=?XIE
cos^2A+cos^2(pai/3+A)+cos^2(pai/3-A)pai姐系派化简
化简cos(pai/7)*cos(2pai/7)*cos(4pai/7)
[tan(pai-a)cos(2pai-a)sin(-a+3pai/2)]/[cos(-a-pai)sin(-pai-a)]=
三角函数 sin7/5pai*cos(-11/6pai)+tan(-15/4pai)*tan7/5pai
sin7/5pai*cos(-11/6pai)+tan(-15/4pai)*tan7/5pai,计算得数,
(sin(a-pai)cot(a-2pai))/(cos(a-pai)tan(a-2pai))
cos (a+4pai)cos ^2(a+pai)sin^2(a+3pai)/ sin(a-4pai)sin(5pai+a)cos^2(-a-pai)
为什么cos^2( pai/8)-sin^2( pai/8) =cos(pai/4)