化简[1-cos^4(A)-sin^4(A)]/[1-cos^6(A)-sin^6(A)] 等于多少?急用!
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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
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!
分子=1-(cos^4A+sin^4A)
=1-[(sin²A+cos²A)²-2sin²Acos²A]
=2sin²Acos²A
分母立方和=1-(sin²A+cos²A)(cos^4A-sin²Acos²A+sin^4A)
=1-(cos^4A+sin^4A)+sin²Acos²A
=3sin²Acos²A
原式=2/3
1-cos^4(A)-sin^4(A)
=1-[cos^2(A)+sin^2(A)]^2+2sin^2(A)cos^2(A)
=2sin^2(A)cos^2(A)
1-cos^6(A)-sin^6(A)
=1-[cos^2(A)+sin^2(A)]{[cos^2(A)+sin^2(A)]^2-3sin^2(A)cos^2(A)}
=3sin^2(A)cos^2(A)
原式=2/3
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：(sin^6a+cos^6a-1) / (sin^4ª+cos^4a-1)
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)==
(1-sin^4a-cos^4)/(sin^2a-sin^4a) 化简
化简1-cos^4a-sin^4a/1-cos^6-sin^6acos^6应为cos^6a
cos^4A-sin^4a 化简
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^4b
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,4sin^2a(1-sin^2a)+cos^22a,