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as (x,y) approaches (0,0) and then for part II (pi/3,-pi/3)

I know that sin(x+Y)/(x+y) would=1 by some simple tweaks. But in my problem, the 2 sins on the numerator are confusing me a little. Since x and y are approaching the same point on the first limit can i say x=y. and write f(x,y)=(sinx+sinx)/2x ?