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thank you in advance for any help!

is this l hospitals rule

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

welcome :)