2 In R show that 2 2 2 @ 2 11 × 11 ²2 + 2 ||1y|11² = 11 × x + yll ² + 11 × -yll ² (Parollelogrom Lou ). _b.) 11 = ~ yll 11 x + yll ≤ 11+ 11 ²2 +11 11² 2 (.) 4(x, y) = 11x +y|1²³ - 11 x-y11² (this is called the polarization identity.

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