# Can You Have A Negative Sine?

## How do you know which quadrant is positive or negative?

Four QuadrantsIn Quadrant I both x and y are positive,in Quadrant II x is negative (y is still positive),in Quadrant III both x and y are negative, and.in Quadrant IV x is positive again, and y is negative..

## Why cosine of negative angle is positive?

Now the measure of the angle is -m, a negative value when measured clockwise is, because all angles have to be acute to apply the various trigonometrical ratios or relations. Hence, cosine of a negative angle changes into a positive value.

## What happens when a is negative?

In conclusion, as the magnitude of a increases, the graph of the parabola becomes narrower, and as the magnitude of a decreases, the graph of the parabola becomes wider. If a is negative, the graph of the parabola opens down instead of up.

## What does a negative sine mean?

The negative -θ of an angle θ is the angle with the same magnitude but measured in the opposite direction from the positive x-axis. … When a point (a,b) is reflected in the x-axis, it moves to the point (a,-b). So Q also has coordinates (cos(θ),-sin(θ)).

## What quadrants is sin negative?

The sine ratio is y/r, and the hypotenuse r is always positive. So the sine will be negative when y is negative, which happens in the third and fourth quadrants.

## Can trig ratios be negative?

Interactive graph The only difference is that now x or y (or both) can be negative because our angle can now be in any quadrant. It follows that the trigonometric ratios can turn out to be negative or positive. In the earlier section, the angles involved were always less than 90° so all 6 ratios were positive.

## 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. … See how the curve appears to be growing in height in the y direction.

## Is sin 1 the same as Arcsin?

Strictly speaking, the symbol sin-1( ) or Arcsin( ) is used for the Arcsine function, the function that undoes the sine. … Think of the Arcsine as the principal arcsine. Restrict the domain to take this inverse function. A function can only be an inverse if it is 1-to-1 and undoes exactly the desired function.

## How do you find negative trig functions?

Based on the unit circle, the negative angle identities (also called “odd/even” identities) tell you how to find the trig functions at -x in terms of the trig functions at x. In other words, they relate trig values at opposite angles x and -x. For example, sin(-x) = -sin(x), cos(-x) = cos(x), and tan(-x) = -tan(x).

## Can a hypotenuse be negative?

Because it is the length of the side of a triangle and lengths cannot be negative.

## What are the four quadrants?

The axes of a two-dimensional Cartesian system divide the plane into four infinite regions, called quadrants, each bounded by two half-axes. These are often numbered from 1st to 4th and denoted by Roman numerals: I (where the signs of the (x; y) coordinates are I (+; +), II (−; +), III (−; −), and IV (+; −).

## Where is sin positive and negative?

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.

## Is cosine ever negative?

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.

## Where is SEC negative?

Sine and cosecant are positive in Quadrant 2, tangent and cotangent are positive in Quadrant 3, and cosine and secant are positive in Quadrant 4.

## What if theta is negative?

Key Takeaways Theta refers to the rate of decline in the value of an option over time. If all other variables are constant, and option will lose value as time draws closer to its maturity. Theta, usually expressed as a negative number, indicates how much the option’s value will decline every day up to maturity.

## What quadrant is sin less than 0?

Quadrant IVThe only quadrant where x is positive, so cos(x)>0 , and y is negative, so sin(x)<0 , is quadrant iv .

## How do you get a negative sin?

Inverse Sine FunctionStart with:sin a° = opposite/hypotenuse.sin a° = 18.88/30.Calculate 18.88/30:sin a° = 0.6293…Inverse Sine:a° = sin−1(0.6293…)Use a calculator to find sin−1(0.6293… ):a° = 39.0° (to 1 decimal place)

## What does a negative do to a graph?

Making the input and the output of a function negative results in a rotation of the function around the origin. Here is a graph of y = f (x) and y = – f (- x). Note that if (x, y) is a point on the graph of f (x), then (- x, – y) is a point on the graph of – f (- x).

## Is Quadrant 4 positive or negative?

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). The quadrants in which cosine, sine and tangent are positive are often remembered using a favorite mnemonic.

## Is sin 1 the same as CSC?

The secant of x is 1 divided by the cosine of x: sec x = 1 cos x , and the cosecant of x is defined to be 1 divided by the sine of x: csc x = 1 sin x .