化简 1-sin^4a-cos^4a/cos^2a-cos^4a
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化简1-sin^4a-cos^4a/cos^2a-cos^4a化简1-sin^4a-cos^4a/cos^2a-cos^4a化简1-sin^4a-cos^4a/cos^2a-cos^4a1-sin^4
化简 1-sin^4a-cos^4a/cos^2a-cos^4a
化简 1-sin^4a-cos^4a/cos^2a-cos^4a
化简 1-sin^4a-cos^4a/cos^2a-cos^4a
1-sin^4a-cos^4a/cos^2a-cos^4a
=[1-(sin²a+cos²a)+2sin²acos²a]/cos²a(1-cos²a)
=(2sin²acos²a)/(cos²asin²a)
=2
∵(1-sin^4a-cos^4a) =1-(sin 2;a+cos 2;a)(sin 2;a-cos 2;a)=1+cos2a=1+2cos 2;a-1=2cos 2;a ∴(sin^2a*cos^4a+sin^4acos^2a
化简1-sin^4a-cos^4a/1-sin^6a-cos^6a
1-sin^6a-cos^6a分之1-sin^4a-cos^4a 化简
化简 1-sin^4a-cos^4a/cos^2a-cos^4a
化简(1-sin^6 a-cos^6 a)/(cos^2 a-cos^4 a)==
化简:(sin^6a+cos^6a-1) / (sin^4ª+cos^4a-1)
(1-sin^4a-cos^4)/(sin^2a-sin^4a) 化简
cos^4A-sin^4a 化简
化简1-cos^4a-sin^4a/1-cos^6-sin^6acos^6应为cos^6a
化简[1-cos^4(A)-sin^4(A)]/[1-cos^6(A)-sin^6(A)] 等于多少?
化简[1-cos^4(A)-sin^4(A)]/[1-cos^6(A)-sin^6(A)] 等于多少?
化简[1-cos^4(A)-sin^4(A)]/[1-cos^6(A)-sin^6(A)] 等于多少?急用!
化简[1-cos^4(A)-sin^4(A)]/[1-cos^6(A)-sin^6(A)] 等于多少?急用!
化简[1-cos^4(A)-sin^4(A)]/[1-cos^6(A)-sin^6(A)] 等于多少?急用!
化简:sin^4a+cos^2a-sin^2a-cos^4a
(1-sin^6a-cos^6a)/(1-sin^4a-cos^4a)=?
(1-sin^4a-cos^4a)/(1-sin^6a-cos^6a)
化简tan a(cos a-sin a)+sin a(sin a+tan a)/1+cos a
化简 sin^4a-cos^4b