Continuity and DifferentiabilityHard
Question
Let y = x3 - 8x + 7 and x = f(t). If
= 2 and x = 3 at t = 0, then
at t = 0 is given by
Options
A.1
B.19/2
C.2/19
D.none of these
Solution
y = x3 - 8x + 7 and x = f(t)
= 2 & x = 3 at t = 0
∵
⇒ 
⇒
∵ at t = 0, x = 3
∴
(at t = 0) = 
∵
⇒
∵ at t = 0, x = 3
∴
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