42

Some IMPERTINENT SCOUNDREL sent this to MY Beloved. When I catch the blighter, I'll horsewhip him on the steps of his club.

Some hold that Maths is dry as dust
And bar it from their home
Yet it encodes the Vernal lust
That drove me to this pome

For aching years my wayward heart
Has followed yours unbidden
But Google this and I'll impart
Our truth in plain sight hidden

sqrt(6-x^2), (sqrt(cos(x))*cos(300x)+sqrt(abs(x))-0.7)*(4-x*x)^0.01, -sqrt(6-x^2) from -4.5 to 4.5

( Hat tip for the formula to Mike Smith, the Human Squid, who may be a dippy arts graduate, but whose inky tentacles are EVERYWHERE. I'll see you at the Diogenes Club, Mike!)