cos²a+cos²b+sin²asin²b-cos²acos²b
=cos²a(1-cos²b)+cos²b+sin²asin²b
=cos²asin²b+cos²b+sin²asin²b
=sin²b(cos²a+sin²a)+cos²b
=sin²b+cos²b
=1
化简：cos²a+cos²b+sin²asin²b-cos²acos&
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