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A tower is standing in the centre of an elliptic field. If Adya observes that the angle of elevation of the top of the tower at an extremity of the major axis of the field is alpha, at its focus is beta and an extremity of the minor axis is gamma, then |
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Answer» `COT^(2) ALPHA = cot^(2) BETA - cot^(2) GAMMA` |
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