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Welcome to the sandbox, a location to test your newfound wiki-editing abilities.

Please note that all contributions here may be deleted periodically and without warning.

In the computer world, a sandbox is a place to test and experiment -- essentially, it's a place to play.

This is the AoPSWiki Sandbox. Feel free to experiment here.

Warning: anything you place here is subject to deletion without notice.

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draw((0,0)--(3,9),black);label("$71^\circ$",(0,0),NE);draw((3,9)--(6,0),black);label("$71^\circ$",(6,0),N...

\lim_{x\to0}\frac{a}{x}

The characteristic polynomial f(\lambda) of the 3 \times 3 matrix \left( \begin{array}{ccc}a & b & c \\d & e & f \\g & h & i \end{array} \right) is given by the equation f(\lambda) = \left| \begin{array}{ccc}\lambda - a & -b & -c \\-d & \lambda - e & -f \\-g & -h & \lamb...

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