→a and →c are unit vectors and |→b|=4. The angle between →a and →c is cos−1(14). If →b−2→c=λ→a, then λ is

→a and →c are unit vectors and |→b|=4. The angle between →a an

1.	→a and →c are unit vectors and \|→b\|=4. The angle between →a and →c is cos−1(14). If →b−2→c=λ→a, then λ is
Answer» $\to a$ and $\to c$ are unit vectors and $\| \to b \| = 4.$ The angle between $\to a a n d \to c i s c o s^{- 1} (\frac{1}{4}) .$ If $\to b - 2 \to c = λ \to a$ , then $λ$ is