1.

If a variable line in two adjacent positions has direction cosines l, m, n and I + deltaI, m + deltam, n + deltan, then show that the small angle delta theta between the two positions is given by delta theta^2=deltal^2+deltam^2+deltan^2.

Answer»


ANSWER :`THEREFORE DELTA theta^2=deltal^2+deltam^2+deltan^2`


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