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Here is a great tool you can plot all your z = f(x,y) 3D functions
online, this tool is supper fast and loaded with tons of functions.
This graphing tool support these functions
sin(), cos(), tan(), asin(), acos(), atan()
ln() - standard natural logarithmic
e - natual base
sqrt() - square root
abs() - absolute value
max() - maximum of two numbers
min() - minimum of two numbers
floor() - revious nearest integer
ceil() - next nearest integer
round() - nearest integer
http://www.livephysics.com/ptools/online-3d-function-grapher.php
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