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cybercrypt13
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Homework Statement
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?
Homework Equations
The Attempt at a Solution
Have no clue where to even start...
Thanks for any help...