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• Elementary Functions
• symbolic
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• trianfml
• trisolve

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[x [,sexp]] = trisolve(A,b [,sexp])

A=['x','y';'0','z'];b=['0';'1'];
w=trisolve(A,b)
x=5;y=2;z=4;
evstr(w)
inv(evstr(A))*evstr(b)