The polar cordinate substitution 1.0

Enter the world of simple math.
  • It was recommended by senior students with the title 'mandatory'.

    Richard, 19
  • Ingenious to learn any math.

    Adam, 19
  • It is the best clear, interpretable, usable learning opportunity for the lowest price.

    Ellen, 23
  • My seventh-grader brother learned to derive, which is quite an evidence that it is explained clearly.

    George, 18