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Sine and cosine - Wikipedia
This definition is consistent with the right-angled triangle definition of sine and cosine when because the length of the hypotenuse of the unit circle is always 1; mathematically speaking, the sine of an angle equals the opposite side of the triangle, which is simply the - coordinate.
En.wikipedia.orgTrigonometric Identities - Math is Fun
The three main functions in trigonometry are Sine, Cosine and Tangent. They are just the length of one side divided by another. For a right triangle with an angle θ : Sine Function: sin (θ) = Opposite / Hypotenuse. Cosine Function: cos (θ) = Adjacent / Hypotenuse. Tangent Function: tan (θ) = Opposite / Adjacent.
Mathsisfun.comTrigonometric Identities - Math.com
A ^2 = b ^2 + c ^2 - 2bc cos (A) (Law of Cosines) (a - b)/ (a + b) = tan [ (A-B)/2] / tan [ (A+B)/2] Free math lessons and math homework help from basic math to algebra, geometry and beyond. Students, teachers, parents, and everyone can find solutions to their math problems instantly.
Math.comsin (x) - Wolfram|Alpha
Sin (x) Compute answers using Wolfram's breakthrough technology & knowledgebase, relied on by millions of students & professionals.
Wolframalpha.comGraph, Table, Properties, Examples | Sine Function - Cuemath
The sine of an angle is a trigonometric function that is denoted by sin x, where x is the angle in consideration. In a right-angled triangle, the ratio of the perpendicular and the hypotenuse is called the sine function.
Cuemath.comTrigonometric Equation Calculator - Symbolab
Use inverse trigonometric functions to find the solutions, and check for extraneous solutions. A basic trigonometric equation has the form sin (x)=a, cos (x)=a, tan (x)=a, cot (x)=a. The formula to convert radians to degrees: degrees = radians * 180 / π.
Symbolab.comSine -- from Wolfram MathWorld
The sine function sinx is one of the basic functions encountered in trigonometry (the others being the cosecant, cosine, cotangent, secant, and tangent). Let theta be an angle measured counterclockwise from the x-axis along an arc of the unit circle.
Mathworld.wolfram.com