Monday, January 18, 2016

calculus - Another proof of limlimitsthetato0fracsinthetatheta=1



I am sorry if this is a duplicate question, but as far as I searched I have not come across this question.





limθ0sinθθ=1. This formula is famously proven by geometrical means using area of a circle and so on..




I want to know if this method of proof over l-hopital's Rule is also acceptable.
limθ0sinθθ=limθ0cosθ1=1


If there is any other method to prove apart from the two methods above. Please Share. Thank You!


Answer



sin(θ)=n=0(1)nθ2n+1(2n+1)!=θ(θ)33!+(θ)55!+....

thensin(θ)θ=1(θ)23!+(θ)45!+....
and the limit as θ0 is 1


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