Everything I told them was correct, though I forgot a few things.
我告诉他们的全部正确，尽管我忘了几件事。
These are tough questions, and there may not be any definitively correct answers. I sure don't have them.
这些都是棘手的问题，可能没有任何绝对正确的答案，我当然不会有。
And so, now if I have proved these two formulas separately, then if you sum them together will get the correct statement.
如果分别证明这两个式子，相加就得到正确的结论。
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