化简sin^2acos^b-cos^2asin^2b+cos^a-cos^2b
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化简sin^2acos^b-cos^2asin^2b+cos^a-cos^2b
sin^2acos^2b-cos^2asin^2b+cos^2a-cos^2b
=cos^2b(sin^2a-1)+cos^2a(1-sin^2b)
=cos^2acos^2b-cos^2acos^2b
=0
=cos^2b(sin^2a-1)+cos^2a(1-sin^2b)
=cos^2acos^2b-cos^2acos^2b
=0
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