Here ( a = 1, h = 2, b = 1 ). Formula: ( \tan\theta = \frac2\sqrth^2 - aba+b = \frac2\sqrt4 - 11+1 = \frac2\sqrt32 = \sqrt3 ). Thus ( \theta = 60^\circ ).
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Find the volume of the parallelepiped whose edges are ( \veca=2\hati-3\hatj+4\hatk,\ \vecb=\hati+2\hatj-\hatk,\ \vecc=3\hati-\hatj+2\hatk ). Here ( a = 1, h = 2, b = 1 )