A chimney leans towards north. At equal ...

A chimney leans towards north. At equal distance due north and south of it in a horizontal plalne, The elevation of the tops are `alpha and beta` respecctively. The inclination of the top of the chimney to the vertical is

`Tan^(-1)[(sin(alpha-beta))/(sin alphasinbeta)]`

`Tan^(-1)[(2sin(alpha-beta))/(sin alphasinbeta)]`

`Tan^(-1)[(sin(alpha-beta))/(2sin alphasinbeta)]`

`Tan^(-1)[(sin(alpha-beta))/(2cosalphacosbeta)]`

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