Ingredient:

Divide gently in a long division sauce pan:

Integrate briskly over a low flame:

Evaluate for and let stand at room temperature for 1000 terms for accuracy to three decimal places.

Add lemon zest to taste.

But this doesn’t look like a pi! or taste like a pi!

or a quarter pi!

Ah, but if we return to the original integral

and make the trigonometric substitution so that then:

and

which, if we return to the original substitution , we see that

So, , which means that:

and since , then

Enjoy your pi!