A) \[9(Q{{T}^{2}}+R{{S}^{2}})=13\,Q{{R}^{2}}\]
B) \[9\,QT=9P{{Q}^{2}}+4\,P{{R}^{2}}\]
C) \[9\,R{{S}^{2}}=4\,P{{Q}^{2}}+9\,P{{R}^{2}}\]
D) All the above
E) None of these
Correct Answer: D
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