Question 1013922
 {{{y = tan (-2theta)}}} 


you have the number stands before theta is {{{2}}}

it means the period of function is {{{pi/2}}} 

 then from {{{0}}} go to the right exactly {{{pi/2}}} to get one point and draw a tan curve from {{{0}}} down since we have negative sign, repeat process  until you get to the point 2pi where graph will end 
since {{{2pi=4(pi/2)}}} you will have {{{4}}} points in all in interval from {{{0}}} to {{{2pi}}}


{{{ graph( 600, 600, -0.2, 6.5, -5, 5, tan(-2x)) }}}