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For a cubic function y=f(x),f^(x)=4x at ...

For a cubic function `y=f(x),f^(x)=4x` at each point `(x , y)` on it and it crosses the `x-a xi s` at `(-2,0)` at an angle of `45^0` with positive direction of the x-axis. Then the value of `|(f(1))/5|` is_______

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