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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
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If
+
−
2
1
1 a
a 2 sin + sin–1
1+ b2
2b = 2 tan–1x, then x is equal to
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