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Mathematics 7 Online
OpenStudy (anonymous):

An aeroplane when 3000m high passes vertically above another aeroplane at an instant when the angle of elevation of aeroplanes at the same observation points are 60 and 45 respectively. How much high is the one plane than the other

OpenStudy (anonymous):

Refer to the Mathematica solution attached.

OpenStudy (anonymous):

On an IMac running OS X, only Chrome will retrieve the pdf file.

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