Find the exact trig value of (2,-6)
your question makes no sense. a point has no trig value.
But, if that point is the terminal point of an angle θ in standard position, then you know that
r^2 = x^2 + y^2
sinθ = y/r
cosθ = x/r
tanθ = y/x
But, if that point is the terminal point of an angle θ in standard position, then you know that
r^2 = x^2 + y^2
sinθ = y/r
cosθ = x/r
tanθ = y/x