(1- tanA ) /(1+ tan A ) = 4+ 根号5 ,则 cot(45° +A )=?急,会的请帮忙,
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![(1- tanA ) /(1+ tan A ) = 4+ 根号5 ,则 cot(45° +A )=?急,会的请帮忙,](/uploads/image/z/5196061-37-1.jpg?t=%EF%BC%881-+tanA+%29+%2F%281%2B+tan+A+%29+%3D+4%2B+%E6%A0%B9%E5%8F%B75+%2C%E5%88%99+cot%EF%BC%8845%C2%B0+%2BA+%29%3D%3F%E6%80%A5%2C%E4%BC%9A%E7%9A%84%E8%AF%B7%E5%B8%AE%E5%BF%99%2C)
(1- tanA ) /(1+ tan A ) = 4+ 根号5 ,则 cot(45° +A )=?急,会的请帮忙,
(1- tanA ) /(1+ tan A ) = 4+ 根号5 ,则 cot(45° +A )=?急,会的请帮忙,
(1- tanA ) /(1+ tan A ) = 4+ 根号5 ,则 cot(45° +A )=?急,会的请帮忙,
注意:tan(45° -A)=(tan45º-tanA)/(1+tan45ºtanA)=(1-tanA)/(1+tanA)
所以 :tan(45° -A)= 4+ 根号5 ,
cot(45º+A)=tan[90º-(45º+A)]=tan(90º-45º-A)=tan(45º-A)= 4+ 根号5
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