tough geometry

Note : The question is NOT incorrect

A and B are 2 points 30 m apart in a line on the horizontal plane through the foot of a tower lying on opposite sides of the tower,If the distances of the tower from A and B are 20 m and 15 m respectively, angle of elevation of the top of the tower at A is cos-1x where x = ?

Options : (pls post the detail solution)
\\4348,2936,cos(sin-14348),cos(sin-12936)\\

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