Before this change: ``` $ ctest Test project /home/jrioux/git/csympy Start 1: test_rcp 1/6 Test symengine#1: test_rcp ......................... Passed 0.01 sec Start 2: test_basic 2/6 Test symengine#2: test_basic ....................... Passed 0.02 sec Start 3: test_arit 3/6 Test symengine#3: test_arit ........................***Exception: Other 0.48 sec Start 4: test_poly 4/6 Test symengine#4: test_poly ........................ Passed 0.01 sec Start 5: test_functions 5/6 Test symengine#5: test_functions ................... Passed 0.02 sec Start 6: test_subs 6/6 Test symengine#6: test_subs ........................ Passed 0.01 sec 83% tests passed, 1 tests failed out of 6 Total Test time (real) = 0.58 sec The following tests FAILED: 3 - test_arit (OTHER_FAULT) Errors while running CTest ``` The log gave the failing test in test_arit: ``` 3x^2 + 2x^3 + x^4 + 2x^5 + x^6 x^2 + 2x^3 + 3x^4 + 2x^5 + x^6 test_arit: /home/jrioux/git/csympy/src/tests/basic/test_arit.cpp:421: void test_expand2(): Assertion `eq(r1, r2)' failed. ``` Benchmarks gave: ``` $ for f in benchmarks/expand{1,2,2b,3}; do ./$f; done Expanding: (y + z + w + x)^60 170ms number of terms: 39711 Expanding: (y + z + w + x)^15*((y + z + w + x)^15 + w) 1743ms number of terms: 6272 poly_mul start poly_mul stop 135ms number of terms: 6272 Expanding: (z^x + x^y + y^x)^100 44ms number of terms: 5151 ``` After this change: ``` $ ctest Test project /home/jrioux/git/csympy Start 1: test_rcp 1/6 Test symengine#1: test_rcp ......................... Passed 0.00 sec Start 2: test_basic 2/6 Test symengine#2: test_basic ....................... Passed 0.01 sec Start 3: test_arit 3/6 Test symengine#3: test_arit ........................ Passed 0.02 sec Start 4: test_poly 4/6 Test symengine#4: test_poly ........................ Passed 0.01 sec Start 5: test_functions 5/6 Test symengine#5: test_functions ................... Passed 0.00 sec Start 6: test_subs 6/6 Test symengine#6: test_subs ........................ Passed 0.00 sec 100% tests passed, 0 tests failed out of 6 Total Test time (real) = 0.06 sec ``` Benchmarks give: ``` $ for f in benchmarks/expand{1,2,2b,3}; do ./$f; done Expanding: (y + z + w + x)^60 169ms number of terms: 39711 Expanding: (y + z + w + x)^15*((y + z + w + x)^15 + w) 1837ms number of terms: 6272 poly_mul start poly_mul stop 135ms number of terms: 6272 Expanding: (z^x + x^y + y^x)^100 44ms number of terms: 5151 ```

Document how to do comparisons #2

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