Sow that x1 hat i+y1 hat j+z1 hat k ,x2 ...

Sow that `x_1 hat i+y_1 hat j+z_1 hat k ,x_2 hat i+y_2 hat j+z_2 hat k ,a n dx_3 hat i+y_3 hat j+z_3 hat k ,` are non-coplanar if `|x_1|>|y_1|+|z_1|,|y_2|>|x_2|+|z_2|a n d|z_3|>|x_3|+|y_3|` .

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