Cartão Funny Pun Twigonometry Happy Birthday

It is tricky to do a trigonometry joke, because you have to approach it from the right angle. It is probably a sine that you are on the correct path when you have a good vision of your joke (which I can planely secant you?). If you are a minor taking out a loan to open a trigonometry tutoring business, you will probably have to ask your parents to cosine. Please enjoy this funny pun happy birthday card!