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If $\vec{a}$ and $\vec{b}$ are two unit vectors such that $\vec{a}+2\vec{b}$ and $5\vec{a}-4\vec{b}$ are perpendicular to each other, then the angle between $\vec{a}$ and $\vec{b}$ is:





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md Israil-pic
md Israil , Bachlar of Arts
Commented Nov 15 , 2023
Provide with solution, sir

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