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1. A
   -2
2. B
   -1
3. C
   0
4. D
   2

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1. A
   $\cos\!\left(\ln\frac{2x-3}{x}\right)$
2. B
   $-\frac{3}{x^2}\sin\!\left(\ln\frac{2x-3}{x}\right)$
3. C
   $\frac{3}{x^2}\cos\!\left(\ln\frac{2x-3}{x}\right)$
4. D
   $-\frac{3}{x^2}\cos\!\left(\ln\frac{2x-3}{x}\right)$

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1. A
   2
2. B
   4
3. C
   8
4. D
   16

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1. A
   $\frac{2}{3}$
2. B
   $\frac{1}{2}$
3. C
   $\frac{1}{4}$
4. D
   $\frac{1}{3}$

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1. A
   3 and 4
2. B
   1 and 4
3. C
   2 and 2
4. D
   3 and 2

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1. A
   $y\frac{d^2y}{dx^2}+\left(\frac{dy}{dx}\right)^2=0$ — wait, re-examine
2. B
   $\frac{d^2y}{dx^2}+x^2\left(\frac{dy}{dx}\right)^2=0$
3. C
   $y^2\frac{d^2y}{dx^2}+\left(\frac{dy}{dx}\right)^2=0$
4. D
   $y\frac{d^2y}{dx^2}+\left(\frac{dy}{dx}\right)^2=0$

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1. A
   $x+1=0$
2. B
   $x-2=0$
3. C
   $x-1=0$
4. D
   $x+2=0$

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1. A
   lying on the same circle
2. B
   vertices of a square
3. C
   vertices of a parallelogram that is not a square
4. D
   collinear

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1. A
   $\left(2,\frac{7}{2}\right)$
2. B
   $\left(2,-\frac{7}{2}\right)$
3. C
   $(4,-7)$
4. D
   $(4,7)$

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