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[" Q.If "x^(2)+y^(2)+z^(2)=r^(2)" and "t...

[" Q.If "x^(2)+y^(2)+z^(2)=r^(2)" and "tan alpha=(xy)/(zr)],[" 34"tan beta=(yz)/(xr),tan gamma=(zx)/(yr)" then "alpha+beta+gamma=]

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