Hello. I'm trying to prove: So far, this is what I've done: If it weren't for the pesky , I could simplify the numerator pretty easily. However, that not being the case, I'm not sure what the next step is. Thanks.
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1+2cos(a)+cos^2(a)-(1-cos^2(a))=2cos(a)+2cos^2(a)=...
Thanks, that got me where I needed to go!
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