[t e x] % MathType!MTEF!2!1!+-
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% a!653C!
\[
\begin{array}{l}
n \in N,x \in R – \{ k\pi /k \in Z\} \\
cosxcos2xcos2^2 x…cos2^n x = sin2^{n + 1} x/2^{n + 1} sinx \\
\end{array}
\]
…[/ t e x]
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