I am sorry if this is a duplicate question, but as far as I searched I have not come across this question.
limθ→0sinθθ=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.
limθ→0sinθθ=limθ→0cosθ1=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 θ→0 is 1
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