两分振动方程为,x1=8cos(πt-2π3),x2=5cos(πt-2π3),则合振动方程为()

两分振动方程为,x1=8cos(πt-2π/3),x2=5cos(πt-2π/3),则合振动方程为()

A.x=13cos(πt-π/3)

B.x=3cos(πt-π/3)

C.x=3cos(πt-2π/3)

D.x=13cos(πt-2π/3)

正确答案:A

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