If f(x)={{:(a+bx,xlt1),(4,x=1),(b-ax,xgt...

If `f(x)={{:(a+bx,xlt1),(4,x=1),(b-ax,xgt1):}`
and `underset(xrarr1)f(x)=f(1)`, then find the values of 'a' and 'b '

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