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I am using a function, and the outputs are below. What function am I using?

function($0+0$) = 0

function($73942856-628529469252$) = -1

function($1 + 1$) = 1

function($1+2$) = 1

function($528^0$) = 1

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It could be

The $sign$ function, which maps positive values to 1, negative values to -1, and 0 to 0.

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  • $\begingroup$ Correct! Well done $\endgroup$ – Rohit Jose Sep 7 '18 at 18:34
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I propose

$$f(x) = 0.09388 + 0.62997atan(x) - 0.09388cos(x) + 0.186498sin(x)$$

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  • $\begingroup$ Good try, but the question has already been answered $\endgroup$ – Rohit Jose Sep 7 '18 at 19:11
  • $\begingroup$ Oh my... this answer, I swear, hahah. Just a quick question: by $\rm atan$${}$$(x)$ do you mean $\rm arctan$${}$$(x)$? :P $\endgroup$ – Mr Pie Sep 7 '18 at 21:39
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    $\begingroup$ @user477343 yep $\endgroup$ – mrfish Sep 11 '18 at 18:13
  • $\begingroup$ Thanks for the clarification. To be honest, I sometimes can't be bothered writing $\arctan$,so I quite prefer $\rm atan$ :P $\endgroup$ – Mr Pie Sep 11 '18 at 21:21

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