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eruiz950
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x^{2 } y^{2}=
(x+y)(xy)

(x+y)^{2}=
(x+y)(x+y)
x^{2}+2xy+y^{2}

(xy)^{2} =
(xy)(xy)
x^{2}  2xy + y^{2}

S_{n} =K_{n} + x
 K= Constant
 n= difference between successive terms
 x= Other constant

