化简[1-cos^4(A)-sin^4(A)]/[1-cos^6(A)-sin^6(A)] 等于多少?急用!
1-sin^6a-cos^6a分之1-sin^4a-cos^4a 化简
化简1-sin^4a-cos^4a/1-sin^6a-cos^6a
化简(1-sin^6 a-cos^6 a)/(cos^2 a-cos^4 a)==
求值:1-sin^6a-cos^6a/1-sin^4a-cos^4a
(1-sin^4a-cos^4a)/(1-sin^6a-cos^6a)
(1-sin^6a-cos^6a)/(1-sin^4a-cos^4a)=?
(1-sin^6a-cos^6a)/(sin^2a-sin^4a)
化简 1-sin^4a-cos^4a/cos^2a-cos^4a
证明(cos a-sin a+1)/(cos a+sin a+1)等于(1-sin a)/cos a
(1-sin^6 a-cos^6 a)/(1-sin^4 a-cos^4 a)的化简结果
化简Sin A + Sin 2A / 1+cos A +
证明sin(4A)sin(2A)(1-cos(2A)) cos(4A)cos(2A)(1 cos(2A))=cos(2A