- What does 2 pi n mean?
- How is sin and cos related?
- How do you know if an angle is positive or negative?
- How do you know if a cosine graph is negative?
- Can you have a negative cosine?
- What’s the difference between a sin and cos graph?
- What is the highest value of sin?
- What does negative angle mean?
- What does a negative sine graph look like?
- Does sin or cos start at 0?
- Why is it called cosine?
- How do you turn a negative into a positive?
- What is the cosine of a negative angle?
- What are the minimum and maximum values that sin a can have?
- What does sin to the negative 1 mean?
- What happens when sine is negative?
- Why is cos negative in 2nd quadrant?
- What is a cosine curve?

## What does 2 pi n mean?

– GEdgar Dec 5 ’16 at 21:15.

Think of the unit circle plotted on a Cartesian graph.

x=cosθ, so cosθ≥0 for all values on and to the right of the y-axis.

2nπ comes from the fact that 2π is the period of the cosine function..

## How is sin and cos related?

In a right triangle, the sine of one acute angle, A, equals the cosine of the other acute angle, B. … The cosine of any acute angle is equal to the sine of its complement. Sine and cosine are called “cofunctions”, where the sine (or cosine) function. of any acute angle equals its cofunction of the angle’s complement.

## How do you know if an angle is positive or negative?

Positive and Negative Angles The measure of an angle describes the magnitude and direction of the rotation of the ray from its initial position to its terminal position. If the rotation is counterclockwise, the angle has a positive measure. If the rotation is clockwise, the angle has a negative measure.

## How do you know if a cosine graph is negative?

Hare – sign is in front of the cosine graph. If we draw the negative cosine it will produce the reflection about the x – axis. So the negative cosine graph will be opposite to the positive graph.

## Can you have a negative cosine?

In the third quadrant, all x and y values will be negative, so all sine and cosine values will be negative. … The final quadrant is the fourth quadrant, and there, all x values are positive, but all y values are negative, so sine will be negative, cosine will be positive and tangent values will be negative.

## What’s the difference between a sin and cos 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.

## What is the highest value of sin?

Maximum value of sin θ is 1 when θ = 90 ˚. Minimum value of sin θ is –1 when θ = 270 ˚. So, the range of values of sin θ is –1 ≤ sin θ ≤ 1.

## What does negative angle mean?

: an angle generated in a direction opposite to an arbitrarily chosen usually clockwise direction.

## What does a negative sine graph look like?

The difference with a negative value of a however, is our sine curve now has a negative amplitude. In other words, our graphs are the same as when a was a positive value, but are now reflected across the x-axis. … Notice how different values of a change the amplitude of our sine curve.

## Does sin or cos start at 0?

The Sine Function has this beautiful up-down curve (which repeats every 2π radians, or 360°). It starts at 0, heads up to 1 by π/2 radians (90°) and then heads down to −1.

## Why is it called cosine?

Similarly the cosine can be thought of as measuring the distance from the y-axis of that same point. It is useful to note that the cosine of an angle is the same as the sine of the complement of the angle. … The word sine originally came from the latin sinus, meaning “bay” or “inlet”.

## How do you turn a negative into a positive?

When measured in the negative direction its will be -90°. We simply subtract 270 from 360. Given a negative angle, we add 360 to get its corresponding positive angle. When an angle is -360°, it implies that the object made more than one cycle in clockwise direction.

## What is the cosine of a negative angle?

Notice the negative angle identity involving the cosine function. We have that cos(-x) = cos(x). This tells us that cos(-30) = cos(30).

## What are the minimum and maximum values that sin a can have?

The sine function ranges from -1 to 1, and since there is a two multiplied by the function, the minimum is -2 and the maximum is 2. 3. The sine function ranges between -1 and 1, so the minimum is -1 and the maximum is 1.

## What does sin to the negative 1 mean?

Quick Answer: For a right-angled triangle: The sine function sin takes angle θ and gives the ratio opposite hypotenuse. The inverse sine function sin-1 takes the ratio oppositehypotenuse and gives angle θ And cosine and tangent follow a similar idea.

## What happens when sine is negative?

Both x and y coordinates are negative in the third quadrant. Since the hypotenuse is a +1, both the sine and the cosine must be negative. As the angle increases from 180° to 270°, the sine increases in magnitude but is now negative, so, the sine decreases from 0 to -1.

## Why is cos negative in 2nd quadrant?

For an angle in the second quadrant the point P has negative x coordinate and positive y coordinate. Therefore: In Quadrant II, cos(θ) < 0, sin(θ) > 0 and tan(θ) < 0 (Sine positive). For an angle in the third quadrant the point P has negative x and y coordinates.

## 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.