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Which of the following define scalar products on \(C^3\)
- \( (x,y)= x_1^*y_1\)
- \( (x,y)= x_1^*y_1 - 2 x_2^* y_2 + x_3^*y_3\)
- \( (x,y)= x_1^*y_1 + 2 x_2^* y_2 + x_3^*y_3\)
- \( (x,y)= 3 x_1^*x_1 - x_1y_2 - x_2y_1 + 3x_2 y_2 \)
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4727:Diamond Point
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