Double Integral Calculator Level 2 1.0.0.4

This calculator computes definite double integrals of real functions with two real variables,utilizing double tinh-sinh quadrature scheme. Although some precaution about theoretical foundation of tanh-sinh quadrature exists, in practice the scheme is almost universal. Numerical values are calculated with precision 15-16 digits. All calculation results are reflected in History rich-text-box, which can be saved in file or printed.