A lamp post is sittuated at the middle p...

A lamp post is sittuated at the middle point M of the side AC of a triangular plot ABC with BC=m CA =8 m and AB =9 m. Lamp post subleds an anlgle `15^(@)` at the point B. The height of the lamp post is

` 4( 1-sqrt3) `

` 7( 1+ sqrt3) `

` 7( 2-sqrt3) `

` 7( 2+ sqrt3) `

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