admin百科知識 2022-02-13 3:37:44 1.已知tana=13,tanb=-14求tan(2a-2b).2.已知sin(a+π6)=13求sin(π6-2a)1.已知tana=1/3,tanb=-1/4求tan(2a-2b).2.已知sin(a π/6)=1/3求sin(π/6-2a)網友廻答：匿名網友1.由 tan(α－β)＝(tanα－tanβ)/(1＋tanα•tanβ)和tan2A=2tanA/(1－tan2A),得tan(2a-2b)=(tan2a-tan2b)/(1 tan2a tan2b)=[2tana/(1-tan²a)-2tanb/(1-tan²b)]/{1 4tana tanb/[(1-tan²a)(1-t... db標簽 生活常識_百科知識_各類知識大全»1.已知tana=13,tanb=-14求tan(2a-2b).2.已知sin(a+π6)=13求sin(π6-2a)
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