14.Find at (1,2) for y^3 = xy − 2x^2 + 8.
(A)−
(B)−
(C)
(D)
15.
(A)ln 2(B) 1(C) 2(D)
16.∫ x sec^2 (1 + x^2 )dx =
(A) tan(1 + x^2 ) + C(B) 2tan(1 + x^2 ) + C(C) tan(1 + x^2 ) + C(D) 2 xtan(1 + x^2 ) + C17.Find the equation of the tangent line to 9x^2 + 16y^2 = 52 through (2, −1).
(A)−9x + 8y − 26 = 0
(B) 9 x − 8y − 26 = 0
(C) 9 x − 8y − 106 = 0
(D) 8 x + 9y − 17 = 0