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61.A round Ball of radius r subtends an angle x at the eye of the observer . While the angle of elevation of its centre is y . Find the height of the centre of the ball. In terms of cosec and sin |
| Answer» 61.A round Ball of radius r subtends an angle x at the eye of the observer . While the angle of elevation of its centre is y . Find the height of the centre of the ball. In terms of cosec and sin | |