1.

From a point on the ground, if the angles of elevation of a bird flying at constant speed in a horizontal direction, measured at equal intervals of time are alpha, beta, gamma and delta, then

Answer»

`COT^(2) BETA - cot^(2) gamma = 3 (cot^(2) alpha - cot^(2) delta)`
`cot^(2)beta-cot^(2)delta=3(cot^(2)alpha-cot^(2)gamma)`
`cot^(2)gamma -cot^(2)delta = 3(cot^(2)alpha-cot^(2)beta)`
`cot^(2)alpha-cot^(2)delta=3(cot^(2)beta-cot^(2)gamma)`

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