Prove

It would also be a good idea to provide a legible statement of the problem.
 
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For example, for cosine form of this equation, I have found such good equation to memorize and now I want something like that for this question.
 

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Maryk said:
For example, for cosine form of this equation, I have found such good equation to memorize and now I want something like that for this question.
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Did you figure out the proof of the "cos" equation?

Did you follow the similar "line of attack" for the "sin" problem? If you did - please share your work.
 
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