Differentiation

The program differentiates function using sintaksichekogo analysis
 but not always function appears in such a form as we would like.

  For example the derivative of x * x will be peer like x + x, instead of 2 * x as we would like, the thing is
   that parsing is not unlimited.

      Here are some examples of differentiated functions of my program:

            1. sin (x) - df = cos (x)
            2. x ^ 2 (X squared) df = x * 2
            3. sin (tg (x)) df = (1 / cos (x) ^ 2) * cos (tg (x))
            4. arcctg (x) df = -1 / (x ^ 2 + 1)
            5. sin (2 * x) df = 2 * cos (2 * x)
            6. sin (x * x) df = (x + x) * cos (x * x)

But the whole point of the program is that it is possible to differentiate the function of any complexity in seconds.