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Show numerically that, if a wave cos kx centred on A (so that x is measured...

Show numerically that, if a wave cos kx centred on A (so that x is measured from A) interferes with a similar wave cos k′x centred on B (with x measured from B) a distance R away, then constructive interference occurs in the intermediate region when k = k′ = π/2R and destructive interference if kR= 1/2π and k′R= 3/2π

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