\[ (x+y)^{3} \text { और }(x-y)^{3} \text {. } \] के समान्तर माध्य ज्ञात कीजिए
\[
(x+y)^{3} \text { और }(x-y)^{3} \text {. }
\]
के समान्तर माध्य ज्ञात कीजिए
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