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f(x)=x2
f -1(x)=sq. root(x)
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y2=x [invert y]
(y2)-1=x = 1/y2=x
sq. root(1/y2)= sq. root (x) [y can't be squared, root both sides]
(1/y)=sq. root(x)
y-1=sq. root(x)

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