Does the question let you use a calculator? If so, you simply just enter each question on the calculator (by pressing the appropriate button (i.e sin, cos, tan) that is relevant) and right down the answers provided.
These would be the results:
sin(20) = 0.912945250728
cos(80) = -0.110387243839
tan(35) = 0.473814720414
sin(51) = 0.670229175843
cos(17) = -0.275163338052
I hope this helps.
