Derivatives, polynomials multiplication and division are free. Integrals can be bought for $25 for 900 integrals. (If you don't pay, you won't see a step-by-step explanation of the integral. You will see the final result though.)
An example of a derivative:
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiH_iYlRAmQU-07YF5fHLiFgSBSxlbyc4suzArsRzLVMfVDTzt2SGqF_Lbo9NFlm0iR1QCjHtYsF44K_FBc4fdoAMIQP6aQuh7cnlHWpM7VEkE3JCB7bDhL5yVltWZx9uVwDrDosQ/s400/calc101_derivatives.png)
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