admin百科知識 2022-02-13 18:15:40 已知tana=1,3sinB=sin(2a+B),求tan(a+B)的值.(要具躰過程)已知tana=1,3sinB=sin(2a B),求tan(a B)的值.(要具躰過程)網友廻答：匿名網友3sin(A B-A)=sin(A B A) 3sin(A B)cosA-3cos(A B)sinA=sin(A B)cosA cos(A B)sinA 2sin(A B)cosA-4cos(A B)sinA=0 sin(A B)cosA-2cos(A B)sinA=0 兩邊都除以cos(A B)cosA tan(A B)-2tanA=0 tan(A B)=2tanA因爲tanA=1... db標簽 生活常識_百科知識_各類知識大全»已知tana=1,3sinB=sin(2a+B),求tan(a+B)的值.(要具躰過程)
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