Decide whether or not it is valid if it is use fitch to


Decide whether or not it is valid. If it is, use Fitch to give a formal proof. If it isn't, use Tarski's World to give a counter example.

(upsidedownA)x (Cube(x) V Tet(x))

(backwards E)x ¬Cube(x)

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(backwards E)x Tet(x)

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