Question 999651
I guess you have this:

{{{(cos(690)+sin(600))/(tan(600)*sin(225) )}}}

if yes, then first find the value of each term above


{{{cos(690)=cos(-30)=sqrt(3)/2}}}


{{{sin(600)=sin(-120)= -sqrt(3)/2}}}

{{{tan(600)=tan(-120)=sin(-120)/scos(-120)=(-sqrt(3)/2)/(-1/2))=sqrt(3)}}}

{{{sin(225) =sin(-135)=-sin(45)= -1/sqrt(2)}}}

substitute all in {{{(cos(690)+sin(600))/(tan(600)*sin(225) )}}}

={{{(sqrt(3)/2-sqrt(3)/2)/(sqrt(3)*(-1/sqrt(2)) )}}}

={{{0/(-sqrt(3)/sqrt(2)) }}}

={{{0}}}