<s>
By	O
the	O
squeeze	B-Algorithm
theorem	I-Algorithm
,	O
</s>
<s>
While	O
the	O
proof	O
above	O
is	O
typically	O
featured	O
in	O
modern	O
calculus	O
textbooks	O
,	O
the	O
Wallis	B-Algorithm
product	I-Algorithm
is	O
,	O
in	O
retrospect	O
,	O
an	O
easy	O
corollary	O
of	O
the	O
later	O
Euler	O
infinite	O
product	O
for	O
the	O
sine	O
function	O
.	O
</s>
