Limits, Continuity and Diffrentiability : Limits by direct substitution ) - 7.

Calculus is a very powerful tool in modern mathematics. It is also useful in science, engineering and economics etc,. Modern calculus was developed by Sir Isaac Newton and Gottfried Wilhelm Lebniz in 17th-century.
Limit is the value that a function or a sequence approaches as the input or index approaches some value.
Limits by direct substitution.
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