COS(PAI/5)COS(2PAI/5)=?XIE
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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/5)COS(2PAI/5)=?XIE
cos (a+4pai)cos ^2(a+pai)sin^2(a+3pai)/ sin(a-4pai)sin(5pai+a)cos^2(-a-pai)
cos(a+pai/4)=3/5,pai/2
[cos(a-pai/2)]/[sin(5pai/2+a)]*sin(a-2pai)cos(2pai-a)=
|cos(a/2)|=b,5pai
已知cosa=-3/5,a属于(pai/2,pai),则cos(pai/4-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,
求值Cos pai/17 *cos 2pai/17*cos 4pai/17*cos 8pai/17
如果cos(pai-x)=根号3/2,x属于(-pai,pai],则x的值为A.5pai/6或7pai/6B.正负pai/6C.正负5pai/6D.正负2pai/3
cos(pai/4+x)=3/5,17pai/12
cos(pai/4+x)=3/5,17pai/12
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)]