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We want to test you to see if you can do ten problems in our Exercises section. If you can solve them, then you can prove ANY identities in ANY high school and college trigonometric books. If you can't, however, feel free to let us know. We will be very happy to solve them or help you. But before that, you must be able to solve the ten problems we give you by yourself. If you can't solve them, that means you didn't completely understand our idea, and our strategies. Please take some time to read through our Learning sections again carefully.
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