If the angle of elevation of a cloud from a point \( y \) metres above a pond is \( \alpha \) an...

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If the angle of elevation of a cloud from a point \( y \) metres above a pond is \( \alpha \) and the angle of depression of its reflection in the pond is \( \beta \), prove that the height - of the cloud is \( \frac{y(\tan \beta+\tan \alpha)}{\tan \beta-\tan \alpha} \).
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