'Nother calculator problem

Mark44

Joined Nov 26, 2007
628
Here's another one that's a little harder.

Given an ordinary scientific calculator (defined as one where you enter the number, and then press a function button) that displays a positive number hereinafter known as x:

Calculate the quantity $$\frac{x}{\sqrt{x^{2} + 1}}$$.

Just to make it interesting/challenging, you can't use the digit buttons (0, 1, 2, ..., 9), the arithmetic buttons (+, -, *, /), the square root button, or the square button.

Caveman

Joined Apr 15, 2008
471
1. Take arctan of x
2. Take sine of result of step 1

Mark44

Joined Nov 26, 2007
628
I'm impressed!

Caveman

Joined Apr 15, 2008
471
Got any more? I'm bored at work at the moment.