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1. Use the guidelines of this section to sketch the curve. y = x^3 – 18x^2 + 81x

2. Use the guidelines of this section to sketch the curve. Y = x/x-1

3. Use the guidelines of this section to sketch the curve. y = 1/ x^2 -4

4. Use the guidelines of this section to sketch the curve. Y = x/ x^2 – 9

5. Use the guidelines of this section to sketch the curve. Y = x/ x^3 – 8

6. Use the guidelines of this section to sketch the curve. Y = xsqrt(2 –x)

7. Use the guidelines of this section to sketch the curve. Y = x + cos x

8. Use the guidelines of this section to sketch the curve. Y = x tan x, -pi/2 < x < pi/2

9. Use the guidelines of this section to sketch the curve. Y = e^5x – e^x