I suspect your text book will tell you that the derivative of sin(x) is cos(x), the derivative of cos(x) is -sin(x), the derivative of sinh(x) is cosh(x), and the derivative of cosh(x) is sinh(x).

No, the derivative of is NOT . Nor is the derivative of equal to .

The derivative of istimesthe derivative of which is . That is, the derivative of is .

Now, back to you- what is the derivative of ? What is the derivative of ?