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# test function
f(rho,sigma) := exp(sin(rho) + tanh(sigma));
# 1st derivatives
simplify(diff(f(rho,sigma), rho)); codegen[C](%);
simplify(diff(f(rho,sigma), sigma)); codegen[C](%);
# 2nd derivatives
simplify(diff(f(rho,sigma), rho,rho)); codegen[C](%);
simplify(diff(f(rho,sigma), rho,sigma)); codegen[C](%);
simplify(diff(f(rho,sigma), sigma,sigma)); codegen[C](%);
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