I do not know who to do this.
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Originally Posted by Stuck Man I do not know who to do this. Who? I know: you can do this! Do you know how to substitute values into a function? Basically, you have a function $$f(x_1,y_1,x_2,y_2)=x_1y_2-x_2y_1.$$ How do you expand $$f(x_2,y_2,x_1,y_1)$$ according to the definition above?
Thanks. That was quite unusual.
It was, simply, an exercise in reading and applying a definition. Nothing unusual about that.
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