Answer:
Attachment 1:- x = 17
sin D = EF/DF = 8/17
Attachment 2:- sin D = 8/17
cos D = ED/DF = 15/17
tan D = sin D / cos D = 8/15
sin F = DE/DF = 15/17
cos F = EF /DF = 8/17
tan F = sin F / cos F = 15/8
sin = opposite / hypotenuse
cos = adjacent / hypotenuse
tan = sin / cos (or) opposite / adjacent