How to Find the Tangent on a Graph in Excel. The tangent is defined as the single point where a straight line meets a curved surface. The tangent can be determined with a collection of ...

x = 30 ∘ Draw the horizontal line y = 0.5. The line y = 0.5 crosses the graph of y = sin x four times in the interval 360 ∘ ≤ θ ≤ 360 ∘ so there are four solutions.