FInd the limit.
2a) lim (x,y)-->(0,0) (-5x^2)/(2x^2+3y^2)
2b) lim (x,y)-->(0,0) tan(x^2+y^2)arctan(1/(x^2+y^2))
2c) lim (x,y)-->(2,4) (y^2-2xy)/(y-2x)
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