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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