What is the general antiderivative, $F$, for each function, $f$, below?

1. $f\left(x\right)=\cos\left(x\right)$

   Hint (a):

   Check your work by differentiating your solution. It's easy to make errors with $+$ and $−$ values.

   Answer (a):

   $F\left(x\right)=\sin\left(x\right)+C$

2. $f ( x ) = - \frac { 2 } { x ^ { 2 } }$

   Hint (b):

   Before you antidifferentiate, rewrite $f\left(x\right)$ with a negative exponent.

3. $f\left(x\right) = –9x^{1/3}$

   Hint (c):

   For all of these, don't forget the $+C$