https://www.quora.com/How-can-I-find-the-limit-lim_-limits-x-rightarrow-frac-pi-2-frac-1-cos-x-sin-x-cos-x-1-sin-x
The answer is 1. Use L’Hopital’s rule. Is you vì not know it , use identities 1+cosx = 2cos^2(x/2) , 1-cos x = 2sin^2(x/2), & sinx = 2sin(x/2)cos(x/2) The numerator becomes ...
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https://math.stackexchange.com/questions/739645/trigonometric-limits-solution-needed-lim-x-to-%CF%80-2-frac1-sin-x-cos-x
lim_x odfracpi2 frac1-sin x+cos xsin 2x -cos x =lim_x odfracpi2 frac1-sin x+cos xcos xcdotfrac1lim_x odfracpi2(2sin x-1) The second limit converges khổng lồ 1 ...
https://math.stackexchange.com/questions/2250967/limit-of-trigonometric-function-lim-x-to-pi-3-frac1-2-cosx-sinx
HINT: Use 1-cos(u)=2sin^2(u/2) along with lim_ukhổng lồ 0fracsin(u)u=1 và lim_ukhổng lồ 0fracsin^2(u/2)u=0 chú ý that in the OPhường, 1-2cos(x)=1-cos(u)colorblue+sqrt 3 sin(u)
You don't need any special limit here. Just note that fraccos left(2x ight)+sin left(x ight)sin left(2x ight)+cos left(x ight)=frac1-2sin^2(x)+sin left(x ight)2sin(x)cos(x)+cos(x)=frac(2sin(x)+1)(1-sin(x))(2sin(x)+1)cos(x). ...
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A few observations about your "move" from your second to lớn third line , where you obtain lim_x ightarrowlargefracpi4frac(2t^2-1)(t+sqrtt^2-1)2t^2-1 you forgot to lớn cancel ...
https://math.stackexchange.com/questions/1815465/why-is-this-way-of-doing-lim-x-to-frac-pi2-frac-tan2xx-frac
dfrac an2xx-dfracpi2=dfrac an2left(x-dfracpi2 ight)x-dfracpi2=2cdotdfrac an(2x-pi)2x-pi Actually we have lim_(h) o0dfrac an(h)(h)=lim_h odfracsin hhcdotdfrac1lim_h o0cos h=1 ...
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left< eginarray l l 2 và 3 \ 5 & 4 endarray ight> left< eginarray l l l 2 và 0 & 3 \ -1 và 1 và 5 endarray ight>
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