Calculus is one of the remarkable achievements of human intellect. It is a collection of fascinating and exciting ideas rather than a technical tool. Calculus has two main divisions **‘differential calculus’ and ‘integral calculus’.**

Both had their origin from geometrical problems.

Integral calculus had its origin from the problem of area and differential calculus had its origin from the problem of tangent to a curve.

The term integration means summation. Infact definite integral is the process of finding a limit of a sum.

The integration symbol ‘∫’ was divised by stretching the summation symbol ‘∑’ conveying the meaning of the process.

We consider indefinite integral as reverse process ...

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