sin²a+cosˇ4a+sin²acos²a 化简
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sin²a+cosˇ4a+sin²acos²a 化简
sin²a+cosˇ4a+sin²acos²a 化简
sin²a+cosˇ4a+sin²acos²a 化简
sin²a+cosˇ4a+sin²acos²a
=sin²a+cos²a(cos²a+sin²a)
=sin²a+cos²a
=1