2 ω2-ω2 t2 c) cos2 (kx+ωt) d) cos2 (k2
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The displacement of particles in a string stretched in the x-direction is represented by y. Among the following expressions for y, those describing wave motion are ____________
a) coskxsinωt
b) k2 ω2-ω2 t2
c) cos2 (kx+ωt)
d) cos2 (k2 x2-ω2 t2)
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