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怎么证明tanα×tan(90°-α)=1
人气:439 ℃ 时间:2020-06-20 13:33:12
解答
tan(90°-α)
首先,这个是90,函数名要改变,180那些不变,就是说tan变cot,就行了.
或者用 tanα-tanβ
tan(α-β)=——————
1+tanα ·tanβ
这个试试
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