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If f(x) = |cosx-sinx|, then f ' (pi//6) ...

If `f(x) = |cosx-sinx|,` then `f ' (pi//6)` is equal to

A

`1/2(1+sqrt3)`

B

`1/2(1+sqrt3)`

C

`-1/2 (1-sqrt3)`

D

`1/2 (1- sqrt3)`

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A
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