Factorise the following:- x^2-1_2y-y^2
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Answer:x²-1-2y-y²
x²-(y²+2y+1) (By (a+b)²=a²+b²+2ab)
x²-(y+1)²
Now,we know that ,a²-b²=(a+b)(a-b)
From this,(x+y+1)(x-y-1)
Step-by-step explanation:
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