make a sketch of the figure and you will come up with a right angled tringle with:
i. opposite=ordinate of the given point (not origin)
ii. adjacent=abscisa
iii. hypothenus apply pythagorus theorem or distance formula for the origin and the other. All sides are relative to angle ¤,
there after use definitions of trig ratios:
sin¤=opp/hyp=0.57773
cos¤=0.8165
tan¤=0.7071