- Does a sine graph start at 0?
- How do you prove sin 45?
- Is Quadrant 3 positive or negative?
- What are the 4 quadrants?
- How can you tell if a graph is sine or cosine?
- What is the exact value of sin 0?
- What happens to the graph when 0 a 1?
- What is tan330?
- What is the value for sin 45?
- What does cos theta 0 mean?
- Are sin 45 and cos 45 the same?
- What quadrant is sin positive?
- What quadrant is tan theta less than 0?
- How do you prove that sin 0 is 0?
- Is 90 degrees in the first or second quadrant?
- Can periods be negative?

## Does a sine graph 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..

## How do you prove sin 45?

In a right triangle, one angle is, by definition, 90 degrees so the two acute angles sum to 180- 90= 90 degrees. To prove that sin(45 (degrees)) is 1√2 , consider that if a right triangle has one angle with measure 45 degrees then the other acute angle is 90- 45= 45 degrees also.

## Is Quadrant 3 positive or negative?

Four QuadrantsQuadrantX (horizontal)Y (vertical)IPositivePositiveIINegativePositiveIIINegativeNegativeIVPositiveNegative

## What are the 4 quadrants?

These four sections are called quadrants. Quadrants are named using the Roman numerals I, II, III, and IV beginning with the top right quadrant and moving counter clockwise. Locations on the coordinate plane are described as ordered pairs.

## How can you tell if a graph is sine or cosine?

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 exact value of sin 0?

The hypotenuse, although measuring 1 unit, doesn’t matter, because 0a,a≠0 , always equals 0 , no matter the value of a . Hence, sin0˚=0 .

## What happens to the graph when 0 a 1?

As we can see from the graphs, when 0 < |a| < 1 (|a| means absolute value of a), the parabola appears wider. When |a| > 1, the parabola appears thinner. When a is positive, the parabola opens upwards; when a is negative, the parabola opens downward.

## What is tan330?

Tan values are positive in the 1stand3rd quadrants and negative in the 2ndand4th quadrants. However, they are all linked to the angle in the first quadrant. (θ) 330°=360°−30° tan30°=1√3.

## What is the value for sin 45?

The sine is defined as the ratio between the opposed side and the hypothenuse. Therefore, sin45o=1√2=√22 . In decimal form, it is roughly 0.7071067812 .

## What does cos theta 0 mean?

cos(theta)=0. cos(θ)=0. Take the inverse cosine of both sides of the equation to extract θ from inside the cosine. θ=arccos(0) The exact value of arccos(0) is π2 .

## Are sin 45 and cos 45 the same?

Consider a triangle with angles 90, a, and b. We know by the definitions of sine and cosine that sin(a)=cos(b) and sin(b)=cos(a). So consider the special case of a=b=45. Then sin(45)=sin(a)=cos(b)=cos(45).

## What quadrant is sin positive?

Quadrants and the “cast” Rule In the first quadrant, the values for sin, cos and tan are positive. In the second quadrant, the values for sin are positive only. In the third quadrant, the values for tan are positive only. In the fourth quadrant, the values for cos are positive only.

## What quadrant is tan theta less than 0?

Therefore: In Quadrant III, cos(θ) < 0, sin(θ) < 0 and tan(θ) > 0 (Tangent positive). For an angle in the fourth quadrant the point P has positive x coordinate and negative y coordinate. Therefore: In Quadrant IV, cos(θ) > 0, sin(θ) < 0 and tan(θ) < 0 (Cosine positive).

## How do you prove that sin 0 is 0?

In the same way, we can write the values for Tan degrees. We learned about sin theta 0 degrees value along with other degree values here, this far. Also, derived the value for cos degree and tan degrees with respect sin degrees….Sine Definition In Terms of Sin 0.Sine Degrees/RadiansValuesSin 360° or Sin 2π07 more rows

## Is 90 degrees in the first or second quadrant?

Quadrants & Quadrantal Angles Angles between 0∘ and 90∘ are in the first quadrant. Angles between 90∘ and 180∘ are in the second quadrant. Angles between 180∘ and 270∘ are in the third quadrant. Angles between 270∘ and 360∘ are in the fourth quadrant.

## Can periods be negative?

In general, the period of is , and the period of is . Since the period is the length of an interval, it must always be a positive number. Since it is possible for b to be a negative number, we must use in the formula to be sure the period, , is always a positive number.