化简:tan^2A-sin^2A-tan^2Asin^2A

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化简:tan^2A-sin^2A-tan^2Asin^2A化简:tan^2A-sin^2A-tan^2Asin^2A化简:tan^2A-sin^2A-tan^2Asin^2A=(sin^2A)/(co

化简:tan^2A-sin^2A-tan^2Asin^2A
化简:tan^2A-sin^2A-tan^2Asin^2A

化简:tan^2A-sin^2A-tan^2Asin^2A
=(sin^2A)/(cos^2A)-sin^2A-(sin^2A)/(cos^2A)*sin^2A
=(sin^2A-sin^4A-sin^2Acos^2A)/cos^2A
=(sin^2A(1-sin^2A-cos^2A))/cos^2A
=0

tan^2A-sin^2A-tan^2Asin^2A=(tanA)^2[1-(sinA)^2]-(sinA)^2
=(tanA)^2(cosA)^2-(sinA)^2=(sinA)^2-(sinA)^2=0