tan(a-b)怎么证明的?
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人气:116 ℃ 时间:2020-05-19 04:42:24
解答
tan(a-b)=sin(a-b)/cos(a-b)=(sinacosb-cosasinb)/(cosacosb+sinasinb)
同时除以cosacosb得(tana-tanb)/(1+tanatanb)
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