两个沿x轴的简谐振动表达式分别为x₁=3cos(6t+π/4)cm和x₂=4cos(6t+5π/4)cm，则它们的合振动表达式为
A.x=cos(6t+π/4)cm B.x=cos(6t+5π/4)cm C.x=5cos(6t+π/4)cm D.x=5cos(6t+5π/4)cm正确答案B
两个沿x轴的简谐振动表达式分别为x₁=3cos(6t+π/4)cm和x₂=4cos(6t+5π/4)cm，则它们的合振动表达式为
A.x=cos(6t+π/4)cm B.x=cos(6t+5π/4)cm C.x=5cos(6t+π/4)cm D.x=5cos(6t+5π/4)cm正确答案B
