驗證網址www.mathopenref.com安全性

Secant (sec) - Trigonometry function - Affordable Hosting Plans - Dedicated Web Support | Lunarpages

The derivative of sec(x) In calculus, the derivative of sec(x) is sec(x)tan(x). This means that at any value of x, the rate of change or slope of sec(x) is sec(x)tan(x). For more on this see Derivatives of trigonometric functions together with the derivat...

網址安全性掃描由 google 提供