1.

If f(x)={{:(cos^(-1) (cotx),","x lt pi/2),(a(x[x]-1),"," x ge pi/2):} The value of a for f to be continuous at x=pi/2 is

Answer»

`PI/(2(pi-1))`
`pi-1`
`pi/(pi+1)`
`pi/(pi-1)`

ANSWER :A


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