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You can also for free watch free video tutorials online.
Math Courses Online
If you want to not only know but also understand the math then check out our math video courses. The author wants to make the courses that waty that the tasks were not resolved as is often taught in schools in the so-called "schema", but so that the solution of each task made pleasure. Courses cover the knowledge required for matriculation.
We don't have any math video courses yet. Check out our other courses meanwhile like video course C++