(61) Foctorish:-
(a) (x+y)2_(x-y)2
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( x + y ) ² - ( x - y ) ²
x ² + 2xy + y ² - ( x - y ) ²
x ² + 2xy + y ² - ( x ² - 2xy + y² )
2xy + y² + 2xy - y ²
4xy + y² - y²
4xy
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