(1-sin^6 a-cos^6 a)/(sin^2 a-sin^4 a)=[1-(cos^6 a+sin^6 a)]/(sin^2 a-sin^4 a)=[1-(cos^2a+sin^2a)(cos^4a-sin^2a*cos^2a+sin^4a)]/sin^2a(1-sin^2a)=(1-cos^4a+sin^2a*cos^2a-sin^4a)/(sin^2a*cos^2a)=[(1-cos^...
(1-sin^6 a-cos^6 a)/(sin^2 a-sin^4 a)的化简结果,
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