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Calculating Limits using Limit Laws Notes

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1 2.3 – Calculating Limits using Limit Laws Limit Laws provide a reliable and less tedious way of calculating limits NOTE: All limit laws in this section apply to one sided limits as well ∎ Main Limit Theorems Theorem: Suppose Then 1. 2. 3. 4. 5. 6. 7. 8. 𝑛 is a positive integer c, 𝑎 are constants 𝑓(𝑥) and 𝑔(𝑥) have limits at 𝑎 lim 𝑐 = ,→. lim 𝑥 = ,→. lim 𝑐𝑓(𝑥 ) = ,→. lim [𝑓(𝑥 ) ± 𝑔(𝑥 )] = ,→. lim 𝑓 (𝑥 ) ∙ 𝑔(𝑥 ) = ,→. lim 5(,) ,→. 6(,) = *provided that lim [𝑓(𝑥 )]7 = ,→. lim 98𝑓(𝑥) = ,→. *provided that 2 Example 1: Find each limit by using the limit laws. Indicate which LL was used a. lim 5 = ,→: b. lim 𝑥 = ,→< c. lim 4𝑥 = ,→=> d. lim 𝑥 A = ,→@ e. lim D√𝑥 = ,→B f. lim𝑥 @/: = ,→E g. lim 2𝑥 I = ,→: h. lim(3𝑥 @ − 2𝑥) = ,→I i. j. lim ,→I * √, LMN , = lim ,M> ,→O , = 3 Example 2: Given that lim 𝑓(𝑥) = 4 and ,→: lim[𝑓(𝑥 )@ ∙ D8𝑔(𝑥 )] = ,→: Example 3: (Groupwork) lim 𝑔(𝑥 ) = 8, ,→: find 4 ∎ Direct Substitution Theorem: If 𝑓(𝑥) is a polynomial or a rational function, lim 𝑓(𝑥 ) = 𝑓(𝑎), provided that 𝑓(𝑎) is defined Then ,→. Note: In a later section, we see more functions with direct substitution property Example 4: Evaluate each limit. a. lim ,→@ b. lim O, R=>:,M>B :, L =B,=E , L => ,→> ,M> c. lim , L => ...
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