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निम्न का मान ज्ञात कीजिए । (x+y+2z)(x^...

निम्न का मान ज्ञात कीजिए ।
`(x+y+2z)(x^(2)+y^(2)+4z^(2)-xy-2yz-2zx)`

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Simplify: (x+y+2z)(x^(2)+y^(2)+4z^(2)-xy-2yz-2zx)

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