The terminal side of θ passes through the point (7, −1) . What is the exact value of sinθ in simplified form?
(7, - 1) = (x, y)
sin θ = y / r
We need to find r = √ [x^2 + y^2 ] = √ [ (7)^2 + (-1)^2 ] = √ 50
So....
sin θ = - 1 / √ 50 = - √ 50 / 50