Question 733495
You can make {{{ 5x }}} change in {{{ pi/2 }}} increments
as follows:
{{{ 5x[1] = 0 }}}, {{{ x[1] = 0 }}}
{{{ 5x[2] = pi/2 }}}, {{{ x[2] = pi/10 }}}
{{{ 5x[3] = pi }}}, {{{ x[3] = pi/5 }}}
{{{ 5x[4] = (3*pi)/2 }}}, {{{ x[4] = (3*pi)/10 }}}
{{{ 5x[5] = 2*pi }}}, {{{ x[5] = (2*pi)/5 }}}       
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{{{ y[1] = 8*cos( 5*0 ) }}}
{{{ y[2] = 8*cos( 5*(pi/10) ) }}}
{{{ y[3] = 8*cos( 5*(pi/5) ) }}}
{{{ y[4] = 8*cos( 5*(3*pi/10 )) }}}
{{{ y[5] = 8*cos( 5*(2*pi/5)) }}}
--------------------------
{{{ y[1] = 8*1 }}}
{{{ y[2] = 8*0 }}}
{{{ y[3] = 8*(-1) }}}
{{{ y[4] = 8*0 }}}
{{{ y[5] = 8*1 }}}
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Now just plot the points
( x1 , y1 ) = {{{ 0 }}}, {{{ 8 }}}
( x2 , y2 ) = {{{ pi/10 }}}, {{{ 0 }}}
( x3 , y3 ) = {{{ pi/5 }}}, {{{ -8 }}}
etc.
The cycles just keep repeating