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Find the value of `x` for which `f(x)=sqrt(sinx-cosx)` is defined, `x in [0,2pi)dot`

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Find the value of `x` for which `f(x)=sqrt(sinx-cosx)` is defined, `x in [0,2pi)dot`
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`f(x)=sqrt(sinx-cosx) " is defined if " sinxgecosx`.
image
From the graph, `sinxge cosx,for x in [pi/4,(5pi)/4]`.
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