Solve both of them.
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13 . (Y- 4) ( y-3)
12. (A^2)^2 - ((b+c)^2)^2
(A^2) - (b+c)^2 (A^2) + (b+c)^2
{(A) - (b+c) (A) + (b+c)} (A^2) + (b+c)^2
12. (A^2)^2 - ((b+c)^2)^2
(A^2) - (b+c)^2 (A^2) + (b+c)^2
{(A) - (b+c) (A) + (b+c)} (A^2) + (b+c)^2
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