+ + + =

It is implicit filled contour plot of a function of two variables over ranges. The line checkbox is implicit line plot of a function of two variables over ranges. The contour checkbox is contour by putting your expression inside the sin( ) function.

For example :

In order to put x*x-y*y-t inside sin( ), by clicking the contour checkbox e.g.
1. sin(x*x-y*y-t),

   In order to fill between 2 functions f1 and f2, by f1(y-x)*f2(y-x), e.g.

2. (y-sin(x)-1)*(y-sin(x)-t) 2D surface between 2 sin(x) functions, please change the t slide.
3. (y*y+x*x-1)*(y*y+x*x-t) 2D surface between 2 circles, please change the t slide. 
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