The angle of elevation of a cliff at a point A on the ground and a point B, 100 m vertically at A are a and b respectively. The height of the cliff is [EAMCET 1986]

\[\frac{100\,\,\cot \beta }{\cot \beta +\cot \alpha }\]

\[\frac{100\,\,\cot \,\alpha }{\cot \alpha -\cot \beta }\]

\[\frac{100\,\,\cot \beta }{\cot \,\alpha -\cot \,\beta }\]

\[\frac{100\,\,\cot \beta }{\cot \beta -\cot \alpha }\]

The angle of elevation of a cliff at a point A on the ground and a poi

1.	The angle of elevation of a cliff at a point A on the ground and a point B, 100 m vertically at A are a and b respectively. The height of the cliff is [EAMCET 1986]
A.	\[\frac{100\,\,\cot \,\alpha }{\cot \alpha -\cot \beta }\]
B.	\[\frac{100\,\,\cot \beta }{\cot \,\alpha -\cot \,\beta }\]
C.	\[\frac{100\,\,\cot \beta }{\cot \beta -\cot \alpha }\]
D.	\[\frac{100\,\,\cot \beta }{\cot \beta +\cot \alpha }\]
Answer» D. \[\frac{100\,\,\cot \beta }{\cot \beta +\cot \alpha }\]

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The angle of elevation of a cliff at a point A on the ground and a point B, 100 m vertically at A are a and b respectively. The height of the cliff is [EAMCET 1986]

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