Why Was a Loan Refused to sin2r = 2sin r?

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Why was the identity sin2r = 2sin r refused a loan?

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He needed a cos r (cosigner).
**
 
Because it needs a CosR
Sin2R = 2SinR*CosR
 
I was quite hyped when I saw the name soroban since in another forum someone asked about his well-being. I was going to tell him when I noticed that soroban's post was made in 2012.
 

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