cos[arc tan(-5)]的值

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cos[arctan(-5)]的值cos[arctan(-5)]的值cos[arctan(-5)]的值设tanx=-5则x=arctan(-5)原式=cos(arctan(-5)]=cosx由tanx

cos[arc tan(-5)]的值
cos[arc tan(-5)]的值

cos[arc tan(-5)]的值
设tanx=-5
则x=arc tan(-5)
原式=cos(arc tan(-5)]
=cosx
由tanx=-5
得cosx=√26/26
即答案是:√26/26
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