Check Initial Value: First, let's plug in the values of x and y as 0 to see if the function is defined at that point.(x,y)→(0,0)limx4+y2x2+y4=04+0202+04=00We get an indeterminate form, so we need to do more work to find the limit.
Approach Along y-axis: Let's try approaching (0,0) along the y-axis (x=0).(x,y)→(0,0)limx4+y2x2+y4=(y)→(0)lim04+y202+y4=(y)→(0)limy2y4Simplify the expression.(y)→(0)limy2y4=(y)→(0)limy2=0
Approach Along x-axis: Now, let's approach (0,0) along the x-axis (y=0).(x,y)→(0,0)limx4+y2x2+y4=(x)→(0)limx4+02x2+04=(x)→(0)limx4x2Simplify the expression.(x)→(0)limx4x2=(x)→(0)limx21As x approaches 0, x21 approaches infinity.
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