23)
f=(x-1)^1/2+(2-x)^-1/2
f'=1/2(x-1)^-1/2+1/2(2-x)^-3/2
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23)
f=(x-1)^1/2+(2-x)^-1/2
f'=1/2(x-1)^-1/2+1/2(2-x)^-3/2