Solve this following

Question:

Show that the points $A, B$ and $C$ having position vectors $(3 \hat{\mathrm{i}}-4 \hat{\mathrm{j}}-4 \hat{\mathrm{k}}),(2 \hat{\mathrm{i}}-\hat{\mathrm{j}}+\hat{\mathrm{k}})$ and $(\hat{\mathrm{i}}-3 \hat{\mathrm{j}}-5 \hat{\mathrm{k}})$ respectively, form the vertices of a right-angled triangle.

Solution:

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