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y=− x 4 − 7 4§ 2. Экзаменационная работа 1996/1997 уч. г. 39x ′ t = 4 − t2 (t + 2)(t − 2)t 2 = −t 2 , y t ′ = t2 − 1 (t + 1)(t − 1)t 2 =t 2 ,y x ′ = t2 − 14 − t 2 , 6t 3y′′ xx =(4 − t 2 ) 3 = −6t 3(t + 2) 3 (t − 2) 3 .yt→+∞t→+0A B C D0xy=−x−1t→−0t→−∞(A(−4; 0) (t = 1), B −3; 1 ) ((t = 2), C 5; − 9 )(t = −2);22в точках B и C касательные вертикальны;D(6; −4) (t = −1).Рис. 148. limn→∞ x n = 2.
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