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Let veca , vecb and vecc be three unit v...

Let `veca , vecb and vecc` be three unit vectors such that `|veca - vecb|^2 + |veca - vecc|^2 =8` . Then `|veca + 2vecb|^2 + |veca + 2vecc|^2 ` is equal to ________.

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JEE MAINS PREVIOUS YEAR-JEE MAINS 2020-MATHEMATICS
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