Hello, I'm trying to prove this but I'm not really succeeding.

CodeCogsEqn.gif

I've tried different things :

math1.jpg

math2.jpg

math3.jpg

I don't know if I have to prove it starting from the definition of sinus, or if I have to do a mathematical induction, starting from n to prove it for n+1.

I'd really appreciate some help, thank you.

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