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已知非零實數、滿足則下列不等式中成立的是(    )

A、         B、            C、     D、

A.sinA=sinC                              B.cos(A+B)=cos(C+D)

C.tan(A+B+C)=-tanD                 D.sin(+B)=-cos(+D)

A.|a-b|≤|a-c|+|b-c|                       B.a²+≥a+

C.|a-b|+≥2                          D.

A.a²+b²≥2|ab|                             B.a+b≥2

C.a³+b³+c³≥3abc                           D.

A.|a-b|≤|a-c|+|b-c|                            B.a²+≥a+

C.|a-b|+≥2                            D.