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The angle of elevation of a cliff from a...

The angle of elevation of a cliff from a fixed point is `theta`. After going up a distance of `k` meters towards the the top the cliff at an angle of `phi`, it is found that the angle of elevation is `alpha`. Show that the height of cliff is ` k(cos phi - sin phi cot alpha)/(cot theta - cot alpha)`

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The correct Answer is:
`(k(cos phi-sin phi cot alpha))/(cot theta - cot alpha)`m
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