COS1度×COS2度×COS3度x……xCOS88度×COS89度xCOS90度等于
1个回答
2016-09-24
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因为cos90°=0,
所以cos1°×cos2°×cos3°×……×cos88°×cos89°×cos90°
=(cos1°×cos2°×cos3°×……×cos88°×cos89°×)×0
=0
所以cos1°×cos2°×cos3°×……×cos88°×cos89°×cos90°
=(cos1°×cos2°×cos3°×……×cos88°×cos89°×)×0
=0
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