You have learnt that a travelling wave i...

You have learnt that a travelling wave in a dimension is represented by a funcation `y = f(x,t)` where `x` and `t` must appear in the combination `x-vt` or `x + vt`, i.e `y = f(x+- upsilon t)`. Is the coverse true? (Examine if the following funcations for `y` can possibly represent a travelling wave :
(a) `(x - vt)^(2)`
(b) `log [(x + v)//x_(0)]`
(c) `1//(x + v)`

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