Try and solve this one

I have no idea, I found it child's play.
\pi=\sum_{n=0}^\infty(-1)^n\frac{4}{2n+1}
.
 
Aunt Marg said:
It's my understanding that all real men are two-headed. 😇
Click to expand...
Janus.jpg
In ancient Roman mythology, Janus is the god of beginnings and transitions, also of gates, doors, doorways, endings and time. He is usually a two-faced god since he looks to the future and the past. The Romans dedicated the month of January to Janus, his most apparent remnant in modern culture, his namesake, the month of January.
 
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