By EXPANDING L. H. S we GET sec^4¤-sec^2¤= sec^2¤(sec^2¤-1)= (1+tan^2¤)(1+tan^2¤ -1) {as sec^2¤ = 1+tan^2¤}= (1+tan^2¤)tan^2¤ = tan^4¤ + tan^2¤ = R. H. Shence, PROVED
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