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[" UNSOLVED "],[" 1.A round balloon of r...

[" UNSOLVED "],[" 1.A round balloon of redius " " ' subtends an angle "theta],[" at the eye of the observer while the angle of "],[" elevation of its centre is "Q" .Prove that the height of "],[" the centre of the balloon is "a sin phi cosec(theta)/(2)" ."]

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