Troublesome Balloon!!
A spherical balloon of radius "r" while floating in the sky makes an angle "x" in the eye of a viewer ..if the angle of elevation of the center of the balloon in the eye of the viewer be "y" ..let AB be the altitude of the centre of the balloon from the ground..then find the value of AB/(r cosec\frac{x}{2}.siny)
The answer is 1.
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