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The domain of definition of f(x)=sqrt[x-...

The domain of definition of `f(x)=sqrt[x-3-2sqrt(x-4)]-sqrt[x-3+2sqrt(x-4)]` is `[4,oo)` b. `(-oo,4]` c. `(4,oo)` d. `(-oo,4)`

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Given, `f(x) = sqrt(x-3-2sqrt(x-4))-sqrt(x-3+2sqrt(x-4))`
Here,
For `f(x)` to be defined `(x-4) >=0`
`=> (x-4)>=0`
...
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