Let's start by the radians. Just remember that 360º=2pi, so whenever is written in function of pi follows this proportion; for example, pi=180º because it's half that measure and so on.
(I'll adopt three decimals, ok?)
sin((3pi)/2)=sin((3*180º)/2)=sin(270º)=-0.176
cos(-5pi)=cos(-5*180º)=cos(-900º)=cos(-900+360º+360º+360º)=cos(180º)=-0.598
(cot(2pi))/3=(cot(360º))/3=(-0,296)/3=0.099
tan(8pi)/3=tan(1440)/3=2.238/3=0.746
Now, the degrees:
sec(-855º)=sec(-855+360+360+360)=sec(225)=2.722
tan(1080º)=-0.856
sec(-330º)=sec(-330+360)=6.483
csc(945º)=1.722
Now, let's just substitute them!
((-0.176+2.722)(-0.598+0.856))/((0.099+6.483)0.746+1.722)
(2.546*0.258)/(4.910+1.722)=0.657/6.632=0.099
Just remembering: I consisdered only three decimal digits, so this answer is not precise.
