Question: how to plot tsai wu failure envlope in maple?

Hi,

I want to plot the Tsai Wu failure envelope for a given
composite. The Tsai Wu failure criterion (for a pure biaxial
state of stress) is given by:

F1*x+F2*y+F11*x^2+F22*y^2+F12*x*y=1

can someone help me?please.

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