tan β-tan α68. From an aeroplane vertically above a straight horizontal road, the angles ofdepression of two consecutive mile stones on opposite sides of the aeroplane areobserved to be oz and ß. Show that the height in miles of aeroplane above the roadisgiven bytan α tan βtan α + tanß[CBSE 2004]litno Tf and R are the

tan β-tan α68. From an aeroplane vertically above a straight horizon

1.	tan β-tan α68. From an aeroplane vertically above a straight horizontal road, the angles ofdepression of two consecutive mile stones on opposite sides of the aeroplane areobserved to be oz and ß. Show that the height in miles of aeroplane above the roadisgiven bytan α tan βtan α + tanß[CBSE 2004]litno Tf and R are the
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