$z=x+y$

ENDDO

$2\mathrm{.}3$ Develop, debug, and document a program to determine the roots of a quadratic equation, $a{x}^2+bx+c,$ in either a high$-$level language or a macro language of your choice. Use a subroutine procedure to compute the roots $($either real or complex$).$ Perform test runs for the cases $($a$)a=1,b=6,c=2$; $($b$)a=0,b=-4,c=1\mathrm{.}6$; $($c$)a=3,b=2\mathrm{.}5,c=7.$

$2\mathrm{.}4$ The sine function can be evaluated by the following infinite series:

$cosx=1-\frac{x^2}{2!}+\frac{x^4}{4!}-\frac{x^6}{61}+$cdots