化简sin2α+sin2β﹣sin2αsin2β+cos2αcos2β=_1．_刷题宝

题干

化简sin²α+sin²β﹣sin²αsin²β+cos²αcos²β=____．

上一题下一题 0.0难度选择题更新时间:2013-06-21 06:38:53

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1

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