Surveying
The rate of change of parallax dp/dh with respect to change in h, may be expressed as

fB/(H - h)
fB/(H + h)²
fB/(H + h)
fB/(H - h)²

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Surveying
For a line AB

the forebearing of AB and back bearing of BA differ by 180°
both (A) and (B) are correct
the forebearing of AB and back bearing of AB differ by 180°
none is correct

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