Plane Trigonometry. Spherical Trigonometry. In this article, let us discuss the six important trigonometric functions, ratios, trigonometry table, formulas and identities which helps to find the missing angles or sides of a right triangle. Trigonometry Ratios-Sine, Cosine, Tangent.Trigonometry. Sin, Cos and Tan A-Level Maths, Quadrants and the "cast" Rule. On a set of axes, angles are measured anti-clockwise from the positive x-axis. So 30° would be drawn as follows: The angles which lie between 0° and 90° are said to lie in the first quadrant.
Sine, Cosine and Tangent are all based on a Right-Angled Triangle. They are very similar functions so we will look at the Sine Function and then Inverse Sine to learn what it is all about. Sine Function. The Sine of angle θ is: length of the side Opposite. divided by the length of the Hypotenuse. Or more simply: sin ( θ) = Opposite / Hypotenuse
Solution: In the triangle, the longest side (or) the side opposite to the right angle is the hypotenuse. The side opposite to θ is the opposite side or perpendicular. The side adjacent to θ is the adjacent side or base. Now we find sin θ, cos θ, and tan θ using the above formulas: sin θ = Opposite/Hypotenuse = 3/5.Trigonometry. Share. Watch on. The Graphs of Sin, Cos and Tan - (HIGHER TIER) The following graphs show the value of sinø, cosø and tanø against ø (ø represents an angle). From the sin graph we can see that sinø = 0 when ø = 0 degrees, 180 degrees and 360 degrees.Zpbx.