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lim-x-2-11-x-cos-pi-x-2-cot-x-2-




Question Number 193803 by cortano12 last updated on 20/Jun/23
     lim_(x→2)  (((√(11−x)) cos ((π/(x−2))))/(cot (x−2)))=?
$$\:\:\:\:\:\underset{{x}\rightarrow\mathrm{2}} {\mathrm{lim}}\:\frac{\sqrt{\mathrm{11}−\mathrm{x}}\:\mathrm{cos}\:\left(\frac{\pi}{\mathrm{x}−\mathrm{2}}\right)}{\mathrm{cot}\:\left(\mathrm{x}−\mathrm{2}\right)}=? \\ $$
Answered by horsebrand11 last updated on 20/Jun/23
 = lim_(x→2)  ((3 sin ((π/2)−(π/(x−2))))/(cot (x−2)))   = 3 lim_(x→2)  sin (x−2) sin π(((x−4)/(x−2)))   = 3×0 = 0
$$\:=\:\underset{{x}\rightarrow\mathrm{2}} {\mathrm{lim}}\:\frac{\mathrm{3}\:\mathrm{sin}\:\left(\frac{\pi}{\mathrm{2}}−\frac{\pi}{\mathrm{x}−\mathrm{2}}\right)}{\mathrm{cot}\:\left(\mathrm{x}−\mathrm{2}\right)} \\ $$$$\:=\:\mathrm{3}\:\underset{{x}\rightarrow\mathrm{2}} {\mathrm{lim}}\:\mathrm{sin}\:\left(\mathrm{x}−\mathrm{2}\right)\:\mathrm{sin}\:\pi\left(\frac{\mathrm{x}−\mathrm{4}}{\mathrm{x}−\mathrm{2}}\right) \\ $$$$\:=\:\mathrm{3}×\mathrm{0}\:=\:\mathrm{0}\: \\ $$

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