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The shadow of a tower standing on a level plane is found to be 50 m longer when the Sun's elevation is 30º
than when it is 60º. The height of the tower is

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NDA Other Question

A man walks 10m towards a lamp post and notices that the angle of elevation of the top of the post increases
from 30º to 45º. The height of the lamp post is The sum of the direction cosines of z-axis is