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

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The identity sin2r = 2sin r was refused a loan because it required a cosigner, referred to as cos r. The mathematical relationship sin2r = 2sin r * cos r highlights the necessity of cos r in the equation. Additionally, there was a mention of a user named soroban, who had previously posted in 2012, indicating a long-standing interest in the topic.
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Why was the identity sin2r = 2sin r refused a loan?

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He needed a cos r (cosigner).
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Because it needs a CosR
Sin2R = 2SinR*CosR
 
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