B T Bt“(0) (x2 + y2) k2 + की १ 9 2 (2 + ¥Vi – InterviewSolution

1.	B T Bt“(0) (x2 + y2) k2 + की १ 9 2 (2 + ¥Vi
Answer» (x^2 +y^2)((x^2 +y^2) + (x^2 - y^2)(x^2 +y^2)= (x^4 +y^4 + 2x^2y^2) + (x^4 - y^4)= 2x^4 + 2x^4y^4= 2x^4(1 + y^4)

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