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f(x)={(atan^(-1)(1/(x-4)), if 0<=x&lt...

`f(x)={(atan^(-1)(1/(x-4)), if 0<=x<4), (btan^(-1)(2/(x-4)), if 4 < x < 6), (sin^(-1)(7-x)+a pi/4, if 6<=x<=9):}` and `f(4)=pi/2` is continuous on `[0, 8]` then `(a, b)=` (i)`(1,1)` (ii) `(1,-1)` (iii)`(-1,1)` (iv) `(-1,-1)`

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