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已知角为: A-B和A, 求B;所以:B=A - (A-B) sinB= sin[ A - (A-B) ]= - SIN(A-B)*COSA + COS(A-B)SINA由于: SIN(A-B) =4/5, tanA=3/4得出: sinA=3/5, cosA= 4/5SINB= - 7/25