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f(x)=(x-8)^4(x-9)^5,0lt=xlt=10 , monoton...

`f(x)=(x-8)^4(x-9)^5,0lt=xlt=10 ,` monotonically decreases in `((76)/(9, 10)]` (b) `((8, 76)/9)` `(0,8)` (d) `((76)/9, 10)`

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