20. निम्नलिखित व्यंजक का योगफल ज्ञात कीजिए।
x2 - 2xy + y2, 3xy-x2 + 3, x2 + 2xy + y?
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Answer:
x2-2xy+y+3xy-x2+3+X2+2xy+y
x2-x2+x2-2xy+3xy+2xy+y+y+3
X2+3xy+2y+3
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