Скачать или смотреть lim(x--- 1/α) (1−cos(x2+bx+a)​)/2(1−αx)^2=​(1/β​−1/α​)/k

If α is greater than β & β is greater than 0 are the roots of the equation
a x² + b x + 1 = 0, and
lim(x--- 1/α) (1−cos(x2+bx+a)​)/2(1−αx)^2=​(1/β​−1/α​)/k

then k is equal to:

(1) 2β
(2) 2α
(3) α
(4) β

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