prove that
Diagonals of cuboid =
![\sqrt{ {l }^{2} + {b}^{2} + {h}^{2} } \sqrt{ {l }^{2} + {b}^{2} + {h}^{2} }](https://tex.z-dn.net/?f=+%5Csqrt%7B+%7Bl+%7D%5E%7B2%7D+%2B++%7Bb%7D%5E%7B2%7D++%2B++%7Bh%7D%5E%7B2%7D++%7D+)
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