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Q)
From the top of a building of height $h$ metres the angle of depression of an object on the ground is $\alpha$. The distance of the object from the foot of the building, is :
( A ) $h \tan \; alpha$
( B ) $h \; \sin \alpha$
( C ) $h\;cot \; \alpha$
( D ) $h\; \cos \alpha$
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