Sine, Cosine and Tangent are the main functions used in Trigonometry and are based on a Right-Angled Triangle. Before getting stuck into the functions, it helps to give a name to each side of a right triangle: Opposite is always opposite the angle. And Adjacent is always next to the angle.

It answers the question "what angle has sine equal to opposite/hypotenuse?" The symbol for inverse sine is sin-1, or sometimes arcsin.

The Law of Sines (or Sine Rule) is very useful for solving triangles: a sin A = b sin B = c sin C. It works for any triangle:

2019年10月26日 · Learn how to use sine, cosine, and tangent to solve for missing sides of a right tria...

For those comfortable in "Math Speak", the domain and range of Sine is as follows. The sine of an angle has a range of values from -1 to 1 inclusive. Below is a table of values illustrating some key sine values that span the entire range of values. The cosine of an angle is always the ratio of the (adjacent side/ hypotenuse).

2014年2月14日 · I'm a little confused about how you choose to use either sine or cosine or tangent over the others. Are they interchangeable given the same information you have about a right triangle? What are the circumstances that should dictate the use of one over the other?

This page includes a lesson covering 'Using the sine function to find the angle' as well as a 15-question worksheet, which is printable, editable and sendable. This is a KS3 lesson on using the sine function to find the angle. It is for students from Year 8 who are preparing for GCSE.

Sin, cos, and tan functions in trigonometry are defined in terms of two of the three sides (opposite, adjacent, and hypotenuse) of a right-angled triangle. Here are the formulas of sin, cos, and tan. sin θ = Opposite/Hypotenuse. cos θ = Adjacent/Hypotenuse. tan θ = Opposite/Adjacent.

2019年4月25日 · sin -1 is used when you are trying to find the Angle that corresponds to a given Sine. sin ( ) is used when you are trying to find the Sine of a given angle. sin (30°) = 1/2. sin -1 (1/2) = 30°. sin -1 (√3/2) = 60°. Degrees is usually the default mode on calculators but this should work for angles express in Radians too.