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I can't understand a newly defined question in the math exam. Ask God for help (I'd better write it by hand).
Let's talk about ideas first. You don't understand the process I'll write for you.

(2) Connect OA, AB...∠C at 45 degrees.

Vertical OC...OC is triple root three plus three.

(3) ① OCD is 30 degrees; ② Obsessive-compulsive disorder 45 degrees.

③∠COD is 30 degrees; ④∠COD is 45 degrees.

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