cos(x+y)不等于0,cosx*cosy也不等于0吗
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cos(x+y)不等于0,cosx*cosy也不等于0吗
cos(x+y)不等于0,cosx*cosy也不等于0吗
cos(x+y)不等于0,cosx*cosy也不等于0吗
错的,当x=90度,y=90度时,前者不为0,cosx*cosy=0
cos(x+y)不等于0,cosx*cosy也不等于0吗
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