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Math.sin( 2 * Math.PI ) ?

But if you know how to use the Math class as you said in post #3, this should already be familiar to you, so I'm still missing something.

It sounds like it's the solving part you CAN do, but it's parsing the user's commands into the correct formulas that has you stumped. This is a common early project, so try searching for "java...

Review the Math class for the functions already available. Apache has some libraries that also provide these math functions. While I think the core Java Math class will have everything you need,...