7.5  c) limit (cos x) / x where x to pi
     d) limit x*sin(1/x) where x to 0
     j) limit |x|/x where x to 0

7.6  c) limit (x^2+x)/(x^3+1) where x to -1
     d) limit (x^2-2x-3)/(3-x) where x to 3
     j) limit (x+1)/(sqrt(x^2-1)) where x to -1
     j2) limit (x+1)/(sqrt(x^2-4)) where x to -1

7.7  a) limit (sqrt(x)-1)/(x-1) where x to 1
     g) limit (x-sqrt(x^2-x)) where x to infty
        plot (x-sqrt(x^2-x)) where x from 0 to 100


7.8  b) limit x^2/(x+1) where x to infty
		plot x^2/(x+1) where x from 0 to 100
     d) limit sqrt(x^2+1)/(x) where x to -infty
        plot sqrt(x^2+1)/(x) where x from -1 to -100
     h) limit 1/(x^2-7x+1) where x to infty
        plot 1/(x^2-7x+1) where x from 0 to 100

7.9  e) limit (1-cos x)/x^2 where x to 0
     i) limit (sin(3x))/x where x to infty
        plot (sin(3x))/x where x from 1 to 100
     n) limit ((x+1)/(x-2))^(3x-2) where x to -infty
        plot ((x+1)/(x-2))^(3x-2)  plot e^9 where x from -10000 to 0

7.10 b) limit (x+2)/(1-sqrt(x+3)) where x to -2
     d) limit (sqrt(x^2-4x)+x) where x to -infty
     e) limit (x^2*sin(1/x))/(sin x) where x to 0
     i) limit (cos x)/(cos x -1) where x to 0