(D)
(E)
18.
(A)
(B)
(C)
(D)
(E)
19.
(A)
(B)
(C)
(D)
(E)(A)
(B)
(C)
(D)
(E)21.
(A)
(B)(D)20.(C)sec^2 x tan^2 x
tan xy = x ln^3 x3 ln^2 x
3 x ln^2 x + ln^3 x
3(ln x + 1)
none of theseIn each of Questions 21–24, y is a differentiable function of x. Choose the
alternative that is the derivative .
x^3 − y^3 = 1
x
3 x^2