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Let vec(a), vec(b), vec(c ) be three mut...

Let `vec(a), vec(b), vec(c )` be three mutually perpendicular vectors of the same magnitude and equally inclined at an angle `theta,` with the vector `vec(a) + vec(b) + vec(c )`. The `36 cos^(2) 2 theta` is equal to __________ .

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JEE MAINS PREVIOUS YEAR-JEE MAINS 2021-MATHEMATICS (SECTION -B)
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