1.Find the value(s) of x for which the a...

1.Find the value(s) of x for which the angle between the vectors `xi 3j-k` and `xi xi-k` is obtuse. 2.If `a=j+ k` and `b=2i -j+3k` then find (i) component of b along to a (ii) component of b perpendicular to a

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