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Determine each limit or explain why the limit does not exist. (a) lim(x,y)→(5,4) : (x −...

Determine each limit or explain why the limit does not exist.
(a) lim(x,y)→(5,4) : (x − y − 1)/(√(x − y) − 1)

(b) lim(x,y)→(0,1) : (sin(x^(2) + y − 1))/(5y + x^(2) − 5)

(c) lim(x,y)→(3,2) : (4x + y)/(2x − 6)

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