1.

If the angles of depression of the upper and lower ends of a lamp post from the top of a hill of height h metres are alpha and beta respectively, the height of the lamp post (in metres) is

Answer»

a.`(H sin (beta+ALPHA))/(cos alpha sin beta)`
B.`(h sin (beta-alpha))/(cos alpha sin beta)`
C.`(cos alpha sin beta)/(h sin (beta+alpha))`
d.`(cos alpha sin beta)/(h sin(beta-alpha))`

ANSWER :b


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