This is a simple web CAS (computer algebra system). This CAS does not need any server, you are running it locally with the javascript engine of your browser (need a recent browser, e.g. Firefox 19 or Chrome) the 6.5M CAS code is downloaded once (giac.js javascript compiled from native Giac/Xcas by emscripten). The javascript code is at least 10 times and often 100 times slower than the native code, it is therefore recommended to run large computations with Xcas!
Examples of input:
factor(x^4-1); cfactor(x^2+1); normal((x+1)^4)
solve(x^2-3*x+2=0); csolve(x^2=2*i); solve([x+y=1,x-y=3],[x,y])
simplify(sin(3x)/sin(x)); gcd(x^4-1,x^3-1)
f(x):=sin(x^2):; f(sqrt(pi)); f'(2); f'(y)
int(1/(x^4-1)); int(1/(x^4+1)^4,x,0,+infinity)
limit(sin(x)/x,x=0); series(sin(x),x=0,5);
A:=[[1,2],[3,4]]; inv(A); det(A-x*idn(A)); A[0,0]; rref(A); eigenvalues(A); eigenvectors(A);

More documentation.
Giac/Xcas, (c) B. Parisse, R. De Graeve, Institut Fourier, Université de Grenoble I., licensed under the GPL3.
Input:

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