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**I don't understand the meaning of f^(39)(pi/2)??**

## Homework Statement

Find the indicated derivative of

**f(x)=sin x**and evaluate it at x=pi/2.

[tex]f^{(39)}(\pi/2)=[/tex]

## Homework Equations

## The Attempt at a Solution

I'm not sure what the f^39 means??? And it could be f(39)(pi/2)??? but it looks like f raised to the 39th power???

Is this a common way to express a problem, because I have not seen one like this yet?

I know the derivative of sin x, is cos x, and if x=pi/2, then cos(pi/2)=0

But how should I evaluate the rest of this problem?

If f^(39) makes no sense, then f(39)(pi/2) doesn't make any sense, because x=pi/2???