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Let f(x)={{:(x^(2)",","for ",xle1),(1","...

Let `f(x)={{:(x^(2)",","for ",xle1),(1",","for ",1ltxle3),(5-2x",","for ",xgt3):}` Then f'(6) is equal to

A

`-7`

B

3

C

`-2`

D

`-3`

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