Canada | Canadian College Entrance Math Problem On Limit Of A Function.

We know
lim sinx/x for x tend to 0 =1 and( 1-cosx)(1+cosx) =sin^x
Then sin^2/x^2=1 at the end lim 1/cosx×1/1+cosx=1/2

Nice one again 😅😅😅😢

If you use 1-cos x=2(sin(x/2))^2, you can get the answer without Taylor Series.