Question

two waves of same frequency traveling in the same medium but in opposite direction if superposed give rise ti​

Answer 1

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The pattern produced in standing waves can be seen only if there exists a repeated constructive interference of two waves such that they have same amplitude and frequency but they must be travelling opposite to each other in the same medium.

But if we visualize that resulting standing wave, then the visual effect is that of an entire system moving in simple harmonic motion.As all standing waves consists of nodes(points which are stationary and with zero amplitude caused by destructive interference of the superimposing waves) and antinodes(the points at maximum amplitude caused by constructive interference of the superimposing waves), if they travel in same direction then the resulting wave will also propagate in some direction in that medium and remain no more standing.

As your question says about the waves which are travelling in the same direction occupying same frequency and amplitude, they will never produce standing waves. The energy is confined in a standing wave between two nodes. The node displacement in standing waves is zero, so the wave is not travelling at all.

At nodes, two waves travel in exactly same amplitude and out of phrase offset with each other.At antinodes, two waves travel in exactly same amplitude and in phrase reinforce with each other.