- Why Sine is called sine?
- Are sin and cos equal?
- How is sine calculated?
- What sine means?
- What is the formula for tangent?
- What are the characteristics of the graphs of the sine and cosine functions?
- How does sin and cos work?
- Why do we use sine?
- What does a negative cos graph look like?
- Which graph represents a function How do you know?
- How do you go from sin to cos?
- How do you know when to use sine or cosine?
- What is the phase difference between sine and cosine?
- Is tangent sin over COS?
- What is the relationship between sine and cosine?
- What is cos 180 A?

## Why Sine is called sine?

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..

## Are sin and cos equal?

The sine of any acute angle is equal to the cosine of its complement. The cosine of any acute angle is equal to the sine of its complement. of any acute angle equals its cofunction of the angle’s complement.

## How is sine calculated?

In a right triangle, the sine of an angle is the length of the opposite side divided by the length of the hypotenuse. … In any right triangle, the sine of an angle x is the length of the opposite side (O) divided by the length of the hypotenuse (H).

## What sine means?

1 : the trigonometric function that for an acute angle is the ratio between the leg opposite the angle when it is considered part of a right triangle and the hypotenuse.

## What is the formula for tangent?

The tangent function, along with sine and cosine, is one of the three most common trigonometric functions. In any right triangle, the tangent of an angle is the length of the opposite side (O) divided by the length of the adjacent side (A). In a formula, it is written simply as ‘tan’.

## What are the characteristics of the graphs of the sine and cosine functions?

The sine and cosine functions have several distinct characteristics:They are periodic functions with a period of.The domain of each function is and the range is.The graph of is symmetric about the origin, because it is an odd function.The graph of is symmetric about the axis, because it is an even function.

## How does sin and cos work?

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 .

## Why do we use sine?

The sine function is defined as the ratio of the side of the triangle opposite the angle divided by the hypotenuse. This ratio can be used to solve problems involving distance or height, or if you need to know an angle measure. Example: … To find the length of the side opposite the angle, d, we use the sine function.

## What does a negative cos graph look like?

For a negative cosine graph, the graph begins at the minimum, goes up to the maximum and heads back down to the minimum. +Sine graph: For a positive sine graph, the graph begins at the midline, goes up to the maximum, goes back down to the midline until it reaches the minimum and ends back at the midline.

## Which graph represents a function How do you know?

How To: Given a graph, use the vertical line test to determine if the graph represents a function.Inspect the graph to see if any vertical line drawn would intersect the curve more than once.If there is any such line, the graph does not represent a function.More items…

## How do you go from sin to 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)Sep 27, 2017

## How do you know when to 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. Study the triangle ABC shown below.

## What is the phase difference between sine and cosine?

Cosine Expression The Cosine Wave, simply called “cos”, is as important as the sine wave in electrical engineering. The cosine wave has the same shape as its sine wave counterpart that is it is a sinusoidal function, but is shifted by +90o or one full quarter of a period ahead of it.

## Is tangent sin over COS?

Today we discuss the four other trigonometric functions: tangent, cotangent, secant, and cosecant. Each of these functions are derived in some way from sine and cosine. The tangent of x is defined to be its sine divided by its cosine: tan x = sin x cos x .

## What is the relationship between sine and cosine?

Sal shows that the sine of any angle is equal to the cosine of its complementary angle.

## What is cos 180 A?

Cos 180°= – sin 90° (We know that cos ( 270° – a ) = – sin a) The value of sin 90 degree is 1. Substitute the value in the above relation, we get. Cos 180°= – (1) = -1. Therefore, the value of cos 180° is -1.