這是個(gè)最基本的題,
tan(x-45°）=（tanx-1)/(1+tanx tan45°）=1/3
tan2(x-45°）=2tan(x-45°）/(1-tan²（x-45°））=3/4
如果計(jì)算沒問題,這個(gè)題就對了.起碼思路是對滴.
好好學(xué)習(xí),天天向上!
tanx=2,則tan2(x-45°)=?
tanx=2,則tan2(x-45°)=?
數(shù)學(xué)人氣：736 ℃時(shí)間：2020-06-14 11:43:09
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