determine the value of the constant α so that f(x,y) is continuous at (1,-1) if
f(x,y):
i)sin(x+y)/(x^(2 )– y^2 (x,y)≠(0,0)
ii) α (x,y)=(0,0)
f(x,y):
i)sin(x+y)/(x^(2 )– y^2 (x,y)≠(0,0)
ii) α (x,y)=(0,0)
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