Question

How do you express Sin315 as a function

Answer 1

sin 315 is not a function :O
its a value / constant value

how ever sin x is a function of variable x

Answer 2

and since
f(x) = sin x
we can say that f(315) =sin 315

how ever i think u need what slash eplained , not what u asked ffor

Answer 3

sin(315)=sin(360-45); sin(360-x)=-sin(x); therefore, sin 315 = -sin (45)= -0.707