# Quick Answer: Is Cotangent Cosine Over Sine?

## How do you convert sin to cot?

To write the sine function in terms of cotangent, follow these steps:Start with the ratio identity involving sine, cosine, and tangent, and multiply each side by cosine to get the sine alone on the left.Replace cosine with its reciprocal function.Solve the Pythagorean identity tan2θ + 1 = sec2θ for secant.More items….

## Why Sine is called sine?

The word sine comes from the Latin sinus, bosom, because early translators mistook the Arabic word for chord and thought it was the Arabic word for bosom. The “co-” prefix in cosine and cotangent simply stands for co-angle, the complementary angle. The cosine of an angle is the sine of its complementary angle.

## What are the 8 trigonometric identities?

Terms in this set (8)Reciprocal: csc(θ) = csc(θ) = 1/sin(θ)Reciprocal: sec(θ) = sec(θ) = 1/cos(θ)Reciprocal: cot(θ) = cot(θ) = 1/tan(θ)Ratio: tan(θ) = tan(θ) = sin(θ)/cos(θ)Ratio: cot(θ) = cot(θ) = cos(θ)/sin(θ)Pythagorean: sin costs = \$1. … Pythagorean: I tan = get sic. … Pythagorean: I cut = crescent rolls.

## What is a reciprocal identity?

The reciprocal means flipping the numbers. … In general, the reciprocal identities are identities in which the equality relation occurs by swapping or interchanging the numerator and the denominator of the number. Trigonometric functions: Consider the first quadrant with the terminate point of radius r is P(x, y).

## 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.

## What is the equivalent of Cotangent?

Right-angled triangle definitionsFunctionAbbreviationDescriptioncotangentcot (or cotan or cotg or ctg or ctn)adjacentoppositesecantsechypotenuseadjacentcosecantcsc (or cosec)hypotenuseopposite4 more rows

## What is cos in terms of sin?

Sine and cosine are cofunctions. Therefore, the relationship sinx=cos(90−x) and cosx=sin(90−x) applies.

## What is the reciprocal of sin?

The cosecant is the reciprocal of the sine. The secant is the reciprocal of the cosine. The cotangent is the reciprocal of the tangent.

## What is trigonometry formula?

Basic Formulas By using a right-angled triangle as a reference, the trigonometric functions or identities are derived: sin θ = Opposite Side/Hypotenuse. cos θ = Adjacent Side/Hypotenuse. tan θ = Opposite Side/Adjacent Side. sec θ = Hypotenuse/Adjacent Side.

## What is the rule of sin?

The Law of Sines is the relationship between the sides and angles of non-right (oblique) triangles . Simply, it states that the ratio of the length of a side of a triangle to the sine of the angle opposite that side is the same for all sides and angles in a given triangle.

## What are the 9 trig identities?

Sine, Cosine and TangentSine Function:sin(θ) = Opposite / HypotenuseCosine Function:cos(θ) = Adjacent / HypotenuseTangent Function:tan(θ) = Opposite / Adjacent

## What does Sine mean?

In mathematics, the sine is a trigonometric function of an angle. The sine of an acute angle is defined in the context of a right triangle: for the specified angle, it is the ratio of the length of the side that is opposite that angle, to the length of the longest side of the triangle (the hypotenuse).

## What is Cotangent formula?

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

## How do you go from sin to cos?

For example, cosθ = sin (90° – θ) means that if θ is equal to 25 degrees, then cos 25° = sin (90° – 25°) = sin 65°.

## What is sec theta?

The reciprocal cosine function is secant: sec(theta)=1/cos(theta). The reciprocal sine function is cosecant, csc(theta)=1/sin(theta). … And the 3 new functions are secant theta, cosecant theta and cotangent theta. Secant theta is defined as 1 over x. Cosecant theta is 1 over y and cotangent is x over y.

## What is the reciprocal of Tanθ?

The reciprocal tangent function is cotangent, expressed two ways: cot(theta)=1/tan(theta) or cot(theta)=cos(theta)/sin(theta).

## What does R mean in trigonometry?

When you work with angles in all four quadrants, the trig ratios for those angles are computed in terms of the values of x, y, and r, where r is the radius of the circle that corresponds to the hypotenuse of the right triangle for your angle.