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Which of the following quantities are in...

Which of the following quantities are independent of the choice of orientation of the coordinate axes : `vec a +vec`, `3a_x + 2b_y`, `|vec a +vec b- vec c|`, angle between `vec b` and `vec c` , `lambda vec a` , where `lambda` is a scalar ?

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SL ARORA-Motion in a Plane-Excercise
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