deletions | additions       diff --git a/Soluci_n_Tenemos_que_demostrar__.md b/Soluci_n_Tenemos_que_demostrar__.md  index bd13938..ebfb69f 100644  --- a/Soluci_n_Tenemos_que_demostrar__.md  +++ b/Soluci_n_Tenemos_que_demostrar__.md 
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Solución: Tenemos que demostrar que $P(\pi/5)=0$  \[  P(\pi/5)=16\cos^5(\pi/5)-20\cos^3(\pi/5)+5\cos(\pi/5)+1 =\cos(5\cdot\pi/5)+1 \begin{aligned}  P(\pi/5)&=16\cos^5(\pi/5)-20\cos^3(\pi/5)+5\cos(\pi/5)+1 =\\  &=\cos(5\cdot\pi/5)+1  =\cos\pi+1=-1+1=0 \end{aligned}  \]