# Question: What Is The Relationship Between Sin And Cos?

## Why Sine is called sine?

In mathematics, the sine is a trigonometric function of an angle.

The word “sine” (Latin “sinus”) comes from a Latin mistranslation by Robert of Chester of the Arabic jiba, which is a transliteration of the Sanskrit word for half the chord, jya-ardha..

## What is cos sin equal to?

The tangent of x is defined to be its sine divided by its cosine: tan x = sin x cos x . The cotangent of x is defined to be the cosine of x divided by the sine of x: cot x = cos x sin x .

## What is cos in math?

more … In a right angled triangle, the cosine of an angle is: The length of the adjacent side divided by the length of the hypotenuse. The abbreviation is cos. cos(θ) = adjacent / hypotenuse.

## What are the six trigonometric functions?

There are six main trigonometric functions:Sine (sin)Cosine (cos)Tangent (tan)Secant (sec)Cosecant (csc)Cotangent (cot)

## Why is Tan Sin over COS?

Sin is equal to the side opposite the angle that you are conducting the functions on over the hypotenuse which is the longest side in the triangle. Cos is adjacent over hypotenuse. And tan is opposite over adjacent, which means tan is sin/cos.

## How do you convert between sin and cos?

The Basic Two: Sine and Cosine(1) Memorize: sine = (opposite side) / hypotenuse. … (2) sin A = cos(90° − A) or cos(π/2 − A) cos A = sin(90° − A) or sin(π/2 − A)(3) Memorize: … (4) tangent = (opposite side) / (adjacent side)(5) Memorize: … (6) tan A = cot(90° − A) or cot(π/2 − A) … (7) sec A = csc(90° − A) or csc(π/2 − A)

## What Are sin and cos functions?

Sine and cosine — a.k.a., sin(θ) and cos(θ) — are functions revealing the shape of a right triangle. Looking out from a vertex with angle θ, sin(θ) is the ratio of the opposite side to the hypotenuse , while cos(θ) is the ratio of the adjacent side to the hypotenuse .

## What is the COS rule formula?

The Cosine Rule can be used in any triangle where you are trying to relate all three sides to one angle. If you need to find the length of a side, you need to know the other two sides and the opposite angle. Side a is the one you are trying to find….Cosine Rule.cos(A)=b2 + c2 – a22bc

## How do you calculate cos?

In any right angled triangle, for any angle:The sine of the angle = the length of the opposite side. the length of the hypotenuse.The cosine of the angle = the length of the adjacent side. the length of the hypotenuse.The tangent of the angle = the length of the opposite side. the length of the adjacent side.

## Do you use sin cos or tan to find the hypotenuse?

But Which One?SOH…Sine: sin(θ) = Opposite / Hypotenuse…CAH…Cosine: cos(θ) = Adjacent / Hypotenuse…TOATangent: tan(θ) = Opposite / Adjacent

## What is the COS formula?

In any right triangle, the cosine of an angle is the length of the adjacent side (A) divided by the length of the hypotenuse (H). In a formula, it is written simply as ‘cos’. Often remembered as “CAH” – meaning Cosine is Adjacent over Hypotenuse. See SOH CAH TOA.

## Why is sine cosine important?

Because these functions turn up a lot in nature and they also are useful tools in mathematics. The sine and cosine functions are almost the same – they are just shifted a little bit compared to each other. They come up a lot in systems that have circular motion. … The sine function is needed to describe waves.

## What is a cosine curve?

The Cosine Curve The x-coordinate of the point on the unit circle determined by a central angle (in standard position) of x radians is Cos(x). In a unit circle, the radian measure of an angle is the length of the arc subtended by that angle. … The angle x is shown in blue and the value of Cos(x) is shown in green.

## What is the difference between a sine and cosine graph?

In a cosine graph, a positive or negative number vertically flips the graph and determines whether the graph starts at the maximum (if it’s positive) or minimum (if it’s negative). For a sine graph, a positive or negative number vertically flips the graph like it does with a cosine graph.

## Does it matter if I use sine or cosine?

The sine rule is used when we are given either a) two angles and one side, or b) two sides and a non-included angle. The cosine rule is used when we are given either a) three sides or b) two sides and the included angle.