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thank you in advance for any help!
is this l hospitals rule
I tried to do that. but the problem was the fraction as whole is squared so it seems difficult to do expand and derivative
which part u have difficulty with ? first term 1-cos x/2x or 2nd term sin5x/4x ?
The problem is that I can not treat them as different parts since they are squared as whole.
without square, I could have just take Limit separately.
u can bring the limit inside the square function!
by L hopital rule
what do you mean?!
lim (f(x)^2) = [lim f(x)]^2
Oh I did not know that
now can u solve that ?
then I can take limit separately and do L hopital rule
yep, then square the answer
Yep I got it. Thank you for your help