Determinant
Write the values of a1,..,a4, b1,..,b4, c1,..,c4, d1,..,d4 in the boxes. Then press the button.
If you have to put a coefficient using some function symbol (for example 1/5, √2), put it in a numerical form
(0.2, 1.414213562373095), for example using this (or this)
NOTES
examples