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In general, the strategies to prove an identity are as follows.
While you work more and more on problems, using our idea, you will find more and more strategies. You might even solve some problems you can't ever imagine, either in mathematics or in the real world. We honestly wish you to have fun while doing them.
Now, you have finished our Examples section, do you understand our ideas? Do you know all the formulas? Do you understand our examples and know why we took each step? We hope that you very well understand how to discover some clues in a problem and how to choose some formulas to solve the problem by using the clues. If so, we are very happy to congratulate you that you have finished our Learning sections.
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