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2014-07-10T15:37:14+05:30

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Let f(x)= y
so y = x²
so x = +√y or x = - √y
so we see that for every value of x there are two values of y so it is sure that it is not one-one function 
this function creates a graph which is a parabola which gives us the conclusion that it also not a onto function.

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