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Acos(x^2)-x=0 equation

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Numerical solution:

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The solution

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acos\x / - x = 0
$$- x + \operatorname{acos}{\left(x^{2} \right)} = 0$$
The graph
Numerical answer [src]
x1 = 0.824132312302522
x1 = 0.824132312302522