Infinite Product
Calculus
Level
2
\[ \left( 1 - \dfrac1{2^2} \right) \left( 1 - \dfrac1{3^2} \right) \left( 1 - \dfrac1{4^2} \right) \left( 1 - \dfrac1{5^2} \right) \cdots =\, ? \]
by
Ikkyu San