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[" If "x^(2)+y^(2)+z^(2)=^(2)" and "tan ...

[" If "x^(2)+y^(2)+z^(2)=^(2)" and "tan alpha=(xy)/(zr)],[" Q."quad tan beta=(yz)/(xr),tan gamma=(x)/(y')" then "alpha+beta+gamma=]

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