7. Solve the separable ODE [5] dy 1= xy + 2y + 2+ 2. A. In ly + 21 = x2/2 + x. B. In|x + 2) = y?/2 + y + C, where C is an arbitrary constant. C. In ly + 2) = x2/2 + x + C, where C is an arbitrary constant. D. In|x - 21 = y?/2 + y + C, where C is an arbitrary constant E. In ly + 2| = 22/2 - x. F. In |x + 2) = y?/2 - y + C, where C is an arbitrary constant G. Inly - 2) = 12/2 - x + C, where C is an arbitrary constant 8. The separated form of the separable ODE a(x) 24 - b(x)y = 0 is [5] A. ydy = -a(x)b(x)dx. B. # = -27 _LE dr. C. = odr. D. = -de dx. E. du = LO dr. a(x) F. = - a(x) G. ydy = - [LE dr. a(x) 9. Solve the homogeneous first-order ODE. [5] dy = 2+ da tan(y/x) A. In(cos(y/x)) - In |x] = K, where K is an arbitrary constant. B. sin '(y/x) - In|z| = K, where K is an arbitrary constant. C. In | cos(y/x)| + In |z| = K, where K is an arbitrary constant. D. cos-1(y/x) - In |x] = K, where K is an arbitrary constant. E. sin'(y/x) - In |x] = K, where K is an arbitrary constant. F. cos '(y/x) - In |x) = K, where K is an arbitrary constant. G. sin(y/x) - In |x) = K, where K is an arbitrary constant. 10. Solve the ODE [5] dy y - 2x da x + 2y A. In(vx2 + y?) + tan-1(x/y) = K, where K is an arbitrary constant. B. In(vx2 + y?) - tan(y/x) = K, where K is an arbitrary constant. C. In( vx2 + y?) + tan '(y/x) = K, where K is an arbitrary constant. D. In(vx2 + y?) - tan '(y/x) = K, where K is an arbitrary constant. E. In(x2 + y?) + tan '(y/x) = K, where K is an arbitrary constant. F. In(vx2 + y?) + tan(y/x) = K, where K is an arbitrary constant. G. In(x2 + y?) - tan '(y/x) = K, where K is an arbitrary constant. 11. The general solution of the exact ODE (y cos(x) + 2rev) dx + (sin(x) + x2e" + 2) dy = 0 is [5] A. (sin(x) + xe + 2)y = C, where C is an arbitrary constant. B. ysin(x) + xe + 2y = C, where C is an arbitrary constant. C. (ycos(x) + 2re") a + (sin(x) + xle" + 2) y = C, where C is an arbitrary constant. D. (ycos(x) + 2xev)x = C, where C is an arbitrary constant. E. J(ycos(x) + 2xe")dx + /(sin(x) + x2e" + 2)dy = C, where C is arbitrary constant. F. -ycos(x) + xle + 2y = C, where C is an arbitrary constant G. y' cos(x)/2 + x2e" + 2y = C, where C is an arbitrary constant. 12. The general solution of the exact ODE 2ty - 2t ) at + [In(t2 + 1) - 2] dy = 0 is [5] A. yln(t2 + 1) + 12 - 2y = K, where K is an arbitrary constant. B. y" In(t2 + 1) - 12 - 2y = K, where K is an arbitrary constant. C. yln(t2 + 1) - 12 + 2y = K, where K is an arbitrary constant. D. y - In(t2 + 1) - 12 - 2y = K, where K is an arbitrary constant. E. yln(t2 + 1) - 12 - 2y = K, where K is an arbitrary constant. F. y In(t2 + 1) - 12 - 2y? = K, where K is an arbitrary constant. G. y + In(t2 + 1) - 12 - 2y = K, where K is an arbitrary constant. 13. Integrate the exact ODE [5] (3y e3zu - 1) dx + (2yev + 3xyearv) dy = 0 A. yeazy - x* = C. where C is an arbitrary constant. B. y?eazy - x = C, where C is an arbitrary constant. C. yeazy - x? = C. where C is an arbitrary constant. D. yeazy - x3 = C. where C is an arbitrary constant. E. y? = eazy - x + C, where C is an arbitrary constant. F. yeary - x = C, where C is an arbitrary constant.1. Evaluate the indefinite integral f tan in 2) dr using an appropriate substitution. [5] A. tan(x)[In (x) - 1] + K, where K is an arbitrary constant B. tan' [In(x?)] + 4In(x) + K, where K is an arbitrary constant. C. csc(x)[In(x) + 1] + K, where K is an arbitrary constant D. cot(x) [sin(In(x)) - 1] + K, where K is an arbitrary constant. E. sec(x) [cos(In(x)) + 1] + K, where K is an arbitrary constant F. sin(x)[1 - 41n(x)] + K/x, where K is an arbitrary constant G. tan(In(x)) - In(x) + K, where K is an arbitrary constant. 2. Compute the indefinite integral 4 fear In(er + 1) dax by using a convenient substitution. [5] A. (e* + 1)? In(e" + 1) - 4e" + C, where C is an arbitrary constant. B. ve2x + I In(e* + 1) + ex - e2x + C, where C is an arbitrary constant. C. (e2x - 1) In(e# + 1) + e2 + C, where C is an arbitrary constant. D. 2(e2x - 1) In(e* + 1) - e"(e" - 2) + C, where C is an arbitrary constant. E. ve2x + 1 In(e* + 1) - 2e + C, where C is an arbitrary constant. F. (e2x - 2) In(e* + 1) - ex + C, where C is an arbitrary constant. G. 4(e2 + 1)3 In(e# + 1) - e" + C, where C is an arbitrary constant. 3. Evaluate the indefinite integral 2 f a tan-1(x) dar using integration by parts. [5] A. x2 tan 1(x) - In(1 + x2) + A, where A is an arbitrary constant. B. 2rcot-1(x) - In(1 + z?) + A, where A is an arbitrary constant. C. 2xtan-1(x) - In(1 + z?) + A, where A is an arbitrary constant. D. 2:x2 cot(x) - In(1 + x?) + A, where A is an arbitrary constant. E. (x2 + 1) tan (x) - r + A, where A is an arbitrary constant. F. xtan(x) - x2 In(1 + z?) + A, where A is an arbitrary constant. G. (x2 + 4) cot 1(x) - In(1 + z?) + A, where A is an arbitrary constant. 4. Compute the indefinite integral J (x-1)(r+2) 3x-de by employing a partial fraction decomposition of the inte- [5] grand. A. 3r + + C, where C is an arbitrary constant. B. 3x + In (742) + C, where C is an arbitrary constant. C. In 2-D + x' In|x - 1|C, where C is an arbitrary constant. D. 3In + + C, where C is an arbitrary constant. E. 3x2 + + C, where C is an arbitrary constant. F. 3 + In #+ + C, where C is an arbitrary constant. G. 3x + # + C, where C is an arbitrary constant. 5. Evaluate the indefinite integral 8 fav1 - a2 dax by using a convenient trigonometric substitution. [5] A. EV1 - 12 - 4cot-1(x) + 2x2 + K, where K is an arbitrary constant. B. x'VI-r'(23 - 1) - 4cot-1(x) + K, where K is an arbitrary constant. C. EV1 - 2' - 4sec-1(x) + K, where K is an arbitrary constant. D. xV1 - 12 - 4cos-1(x) + K, where K is an arbitrary constant. E. xv1 - x2(2x2 - 1) + sin (x) + K, where K is an arbitrary constant. F. 4xv1 - 12 - 4tan-1(2) + K, where K is an arbitrary constant. G. 8v1 -12 - 4(2x2 - 1) tan '(x) + K, where K is an arbitrary constant. 6. Solve the separable ODE [5] dy 82 + 3y + 2 A. y = 46+2, where K is an arbitrary constant. B. 1 = K(a+1) 2+2 2. where K is an arbitrary constant. C. 2y3 + 9y' + 12y = 3x2 + K, where K is an arbitrary constant. D. y = In K(+1)) (7+2 ), where K is an arbitrary constant. E. y = Ke-2, where K is an arbitrary constant. F. y = In (Ke+2 ), where K is an arbitrary constant. G. y = Il