(tan-495)-(cos -495)等于多少

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(tan-495)-(cos-495)等于多少(tan-495)-(cos-495)等于多少(tan-495)-(cos-495)等于多少=-1+√2/2

(tan-495)-(cos -495)等于多少
(tan-495)-(cos -495)等于多少

(tan-495)-(cos -495)等于多少
=-1+√2/2