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 Dec12 awarded Famous Question Dec21 accepted Prove that $\frac{\sin(2\theta)}{2- \cos(2\theta )} = \frac 1{\tan(\theta)}$ Dec21 comment Prove that $\frac{\sin(2\theta)}{2- \cos(2\theta )} = \frac 1{\tan(\theta)}$ Thanks your have added to my knowledge. Dec21 comment Prove that $\frac{\sin(2\theta)}{2- \cos(2\theta )} = \frac 1{\tan(\theta)}$ It seems wrong identity as you said guys. I tried to prove but I could not so I ask you, I have found it in an old exam paper. Dec21 awarded Editor Dec21 revised Prove that $\frac{\sin(2\theta)}{2- \cos(2\theta )} = \frac 1{\tan(\theta)}$ added 21 characters in body Dec21 asked Prove that $\frac{\sin(2\theta)}{2- \cos(2\theta )} = \frac 1{\tan(\theta)}$ Jun8 awarded Notable Question Jan26 awarded Popular Question Sep1 awarded Scholar Sep1 awarded Supporter Sep1 accepted Can all primes be written as a Mersenne prime? Sep1 asked Can all primes be written as a Mersenne prime? Jan3 awarded Student Jan3 comment Puzzle - where did the extra dollar come from? @Zev Chonoles: I am asking here about showing it by equations .. not the same question. Jan3 asked Puzzle - where did the extra dollar come from?