Arthur D. answered 11/05/15
Tutor
4.9
(274)
Forty Year Educator: Classroom, Summer School, Substitute, Tutor
cos(x-y)/sinxcosy=cotx+tany
cos(x-y)=cosxcosy+sinxsiny
cosxcosy+sinxsiny/sinxcosy
cosxcosy/sinxcosy+sinxsiny/sinxcosy
cosx/sinx + siny/cosy
cotx + tany which is the right side