3-1	Construct the graph of sin(x) with x  ranging in [0, 2]. plot(sin(x),x=0..2*Pi);
3-2	Draw a circle given by the parametric  equations      x=cos(t), y=sin(t), t[0,2]
3-3	Draw the graphs of the first six Chebyshev  polynomials in the interval [-1,1].
3-4	Draw this pretty leaf:
3-5	Draw the graphs of the polynomials given  by the binomial expansions Draw this pretty leaf:
3-6	Construct this pattern of the "sunflower":
3-7	Construct he graph given in polar coordinates by  > r = cos(7/2*t)+1/4; ,  [0,4]>
3-8	Construct this interesting drawing:
3-9	Construct this interesting drawing:
3-10	Draw this interesting pattern:
3-11	Construct a gif file animating the function            f(x,t) = sin (x + t)  and include the gif in your web page.