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[" Q.".58." If "x=r sin theta" cos phi,"...

[" Q.".58." If "x=r sin theta" cos phi,"y=r sin theta sin phi" and "z=" roos then "],[[" (a) "x^(2)+y^(2)+z^(2)=r^(2)," (b) "x^(2)+y^(2)-z^(2)=r^(2)],[" (c) "x^(2)-y^(2)+z^(2)=r^(2)," (d) "z^(2)+y^(2)-x^(2)=r^(2)]]

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