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To understand Limit in Calculus we need to learn various Laws of Limit. Limits have several different types of laws the very first law is constant law. 

Constant law: Suppose we have f(x) =b (where f is constant for all x) then the limits as 'x' approaches 'c' must be equal to b.

: If b and c are constant: lim x→c  b  =b

Identity rule: According to this law, if f(x) =x, then the limit of f as x approaches c is equal to c.

If c is a constant: lim x→c x =c.

Special law of Operational Identities: Ø Suppose we have lim x→c f(x) =L and lim x→c g(x) =M and k is constant then the limit is, 

Constant multiple law: lim x→c kf(x)  = k. lim x→c f(x)  =kL

Addition law: lim x→c [f(x) +g(x)] = lim x→c f(x)  + lim x→c g(x)  =L+M

Difference Law: lim x→c [f(x) -g(x)] = lim x→c f(x)  - lim x→c g(x)  =L-M

Product Law: lim x→c [f(x)g(x)] = lim x→c f(x)  lim x→c g(x)  =LM

Quotient law: lim x→c [f(x) /g(x)] = lim x→c f(x) / lim x→c g(x) =L/M (where M is not equal to zero.)

This is a brief definition of the laws of limits.