cos(-79/6∏)=?cos(-79/6∏)=(∏+12∏+1/6∏)=继续写,别把上面的合了,就这样接下来写
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cos(-79兀/6)
cos
cos(-79π/6)的计算过程
tan(-2010°)+cos(-79π/6)
cos(-19/6∏)=
cos(-7/6)∏=
1+cos(2θ)+cos(4θ)+cos(6θ)=4cosθcos(2θ)cos(3θ)证明相等.
化简cos(π/6a)+cos(π/6-a)=
cos(π/7) + cos(6π/7) =几
cos²兀/6=
cos(-19/6π)=?
cos(-19/6n)=
若sinα+cosβ=2/3 cosα+cosβ=5/6求cos(α-β)
sinα+cosα=1,求cos^2α+cos^6α+cos^8α的值.
化简(1-sin^6 a-cos^6 a)/(cos^2 a-cos^4 a)==
Sina+sin^2a=1,cos^2a+cos^s4a+cos^6a
cos 2π/7 +cos 4π/7 +cos 6π/7=?
请问cos(2π/7)+cos(4π/7)+cos(6π/7)=?,