If →a=3^j−4^k →b=2^i−^j+2^k and →c is directed along the dir – InterviewSolution

1.	If →a=3^j−4^k →b=2^i−^j+2^k and →c is directed along the direction parallel to angle bisector of →a and →b and the projection of →c on →d is of magnitude 109 where →d=4^i−4^j+7^k then \|→c\|2 is
Answer» If $\to a = 3^j - 4^k$ $\to b = 2^i -^j + 2^k$ and $\to c$ is directed along the direction parallel to angle bisector of $\to a$ and $\to b$ and the projection of $\to c$ on $\to d$ is of magnitude $\frac{10}{9}$ where $\to d = 4^i - 4^j + 7^k$ then $\| \to c \|^{2}$ is

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