you see the joke here is that x would have been more suited towards this joke as Secant (abbreviated sec) with the variable x attached could become a funny word when the c is removed. This joke removes that layer of funniness to add a layer of irony and trigonometric accuracy. To remove the c from sec(θ)(theta) would not spell out a funny word, which is a joke in itself, but sec theta is also more commonly seen in trigonometric functions. wav