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数学
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已知a为锐角,当1-tana分之1无意义时,求sin(a-15度)+cos(a-15度)的值
人气:199 ℃ 时间:2020-04-06 18:41:09
解答
1/(1-tana)无意义 即1-tana=0 a=45
sin(45-15)+cos(45-15)=1/2+√3/2
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