Which points are on the graph of y=\cos (\theta )
Any point on the graph of y = cos(θ) would have coordinates (θ, cos(θ)), where θ is any real number. The value of cos(θ) is the y-coordinate of the point on the graph corresponding to the angle θ.
For example, when θ = 0, cos(0) = 1, so the point (0, 1) is on the graph of y = cos(θ). Similarly, when θ = π/2, cos(π/2) = 0, so the point (π/2, 0) is also on the graph.
In general, any point (θ, cos(θ)) where θ is a real number, is on the graph of y = cos(θ).