(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Why does sin(x) - 1/2sin^2(x) + 1/4sin^3(x) - 1/8 sin^4(x) + ... = 2sin(x)/2+sin(x)

How do you know for certain the series converges for all real values of x?

2. Relevant equations

3. The attempt at a solution

Have no clue where to even start...

Thanks for any help...

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# Homework Help: Another Series problem

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