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Prove that the measure of the angle betw...

Prove that the measure of the angle between two main diagonals of a cube is `cos^(-1)frac[1][3]`.

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USHA PUBLICATION-MODEL QUESTION SET-MODEL QUESTION SET
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  4. If the sum of two unit vectors is a unit vector, show that the magnitu...

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  11. Prove by vector method that the mid-point of the hypotentise of a righ...

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  19. If A=[{:(2,1),(-1,3):}],B=[{:(2,3),(1,1):}]andC=[{:(1,0,2),(-2,3,0):}]...

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