If a- b- c- are unit vectors- then the value of - a- -2b- 2 - b- -2c- 2 - c- -2a- 2 does not exceed

The correct option is C 21 |a⃗ 2b⃗|^2+|b⃗ 2c⃗|^2+|c⃗ 2a⃗|^2 =a^2+4b^2 4a⃗b⃗+b^2+4c^2 4b⃗c⃗+c^2+4a^2 4c⃗a⃗ =(a^2+b^2+c^2)+4(a^2+b^2+c^2) 4(a ...

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Inequalities Involving Mathematical Means

If a⃗, b⃗, ...

Question

If $\to a, \to b, \to c$ are unit vectors, then the value of ${∣ ∣ \to a - 2 \to b ∣ ∣}^{2} + {∣ ∣ \to b - 2 \to c ∣ ∣}^{2} + {| \to c - 2 \to a |}^{2}$ does not exceed

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\to a, \to b, \to c

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{∣ ∣ \to a - \to b ∣ ∣}^{2} + {∣ ∣ \to b - \to c ∣ ∣}^{2} + {| \to c - \to a |}^{2}

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