# Tricky infinite sum to enter into computation program

#### rainer

Hi,

Can anyone think of a way to input the following infinite sum into Maxima for computation?

$$\displaystyle \sum_{n=0}^{\infty }2^{n-1}c_n^2$$

(The tricky part...)

where $$\displaystyle c_0=\sin\theta$$

and $$\displaystyle \sin\theta_{n+1}=\frac{1-\cos\theta_n}{1+\cos\theta_n}$$

Rapha
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