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lim x 0 c o s 4 x + c o s 6 x - c o s 6 x c o s 4 x

lim_{x 0} \frac{c o s 4 x + c o s 6 x - c o s 6 x c o s 4 x - 1}{4 x^{2}, t a n^{2} 2 x} =

cdots

. 1

, - 3

. - 5

. - 7

. - 9

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