t= 2y+1 √2ky+kt^{2}= (2y x 1)^{2} 2yk+kt^{2}(2ky +k)= (2y + 1)^{2} 2ky + k= (2y + 1)^{2} t^{2}k(2y + 1)=(2y+1)^{2} t^{2}k=2y+1 t^{2}

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