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The elevation of a tower at a station A ...

The elevation of a tower at a station A due north of it is `alpha` and at a station B due west of A is `beta`. Prove that the height of the tower is `(ABsinalphasinbeta)/(sqrt(sin^2alpha -sin^2beta))`

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Let,`h=PAtanalpha`
=`PA=hcotalpha`
and `h=PBtanbeta`
so,`PB=hcotbeta`
...
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