7.1     a) plot sin(x) x=-2.5..2.5
        b) plot cos(x) x=-2.5..2.5
        c) plot arcsin(x)
        d) plot e^x
        e) plot e^(-x)
        f) plot sqrt(x) x=-0.5..4
        g) plot 1/x x=-2.5..2.5 y=-2..2
        h) plot 1/sqrt(x), 1/x, 1/x^2 where x= 0..10
        i) plot ln(x) x=-0.5..3
        j) plot 1/x^2 x=-3..3 y=0..3
        k) plot x^4 x=-3..3 y=0..3
        l) plot tan(x), x^3 x=-pi/2..pi/2 y = -4..4

7.2     a) plot -x^2+1
        b) plot 2-1/(x+3)
        c) plot |ln(-x)|
        d) plot sqrt(-x-1)
        e) plot e^ln(x)
        f) plot arcsin(3x)-pi/2
        g) 3cos(x/2+1)

7.3     a) plot f(x), 1+f(x-2), x=-2..6 where f(x) = -(x-0.5)(x-2.5)(x+0.5)+0.65
        b) plot f(x), -f(2x), x=-2..4 where f(x) = -(x-0.5)(x-2.5)(x+0.5)+0.65
        c) plot f(x), f(-x/2), x=-4..8 where f(x) = -(x-0.5)(x-2.5)(x+0.5)+0.65
        d) plot f(x), 1+2f(3-x), x=-2..4 where f(x) = -(x-0.5)(x-2.5)(x+0.5)+0.65

7.4     a) plot 3/x-x^3
        b) plot x(5^(2x)-5^(-2x))
        c) plot 5+(x^2*sin(x))/arcsin(x)
        d) plot arcsin(x^2)/(cos x^3*arctan(x))
        e) plot sin x - x*cos x
        f) plot sin x - cos x

7.5     a) plot 3x^3+2
        b) plot 3-2^x
        c) plot 3+arctan x^4
        d) plot (ln x)^2
        e) plot sqrt(x^3)
        f) plot 1+log_10(x-2)
        g) plot 1/2 arcsin(x/3)
        h) plot 1+arccos(1-x)