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## Main Question or Discussion Point

In the case of two fields interfering with each other when calculating the total electric field, cos (phi1-phi2 + kx) = cos( kx) where kx is the path difference between the two fields.

How does cos (phi1-phi2 +kx)=cos(kx) Isit just algebra?

How does cos (phi1-phi2 +kx)=cos(kx) Isit just algebra?