# Examples of sum and difference identities

## What are sum and difference identities?

We can use the sum and difference formulas

**to identify the sum or difference of angles when the ratio of sine, cosine, or tangent is provided for each of the individual angles**. To do so, we construct what is called a reference triangle to help find each component of the sum and difference formulas.## How do you solve for sum and difference identities?

## What is sum and differences?

SUM –

**The sum is the result of adding two or more numbers.****DIFFERENCE – The difference of two numbers is the result of subtracting these two numbers**.## What are the 12 trigonometric identities?

**Sum and Difference of Angles Trigonometric Identities**

- sin(α+β)=sin(α).cos(β)+cos(α).sin(β)
- sin(α–β)=sinα.cosβ–cosα.sinβ
- cos(α+β)=cosα.cosβ–sinα.sinβ
- cos(α–β)=cosα.cosβ+sinα.sinβ
- tan. ( α + β ) = tan β 1 – tan α . tan. β
- tan. ( α – β ) = tan β 1 + tan α . tan.

## What are sum identities?

Sum Identity Examples

The sum identities are **used when one special angle can be added to another, and the result is the given non-special angle**. For example, given the angle 7π12 7 π 12 , find the sine, cosine, and tangent.

## Why do we use sum and difference identities?

The sum and difference formulas can be used

**to find the exact values of the sine, cosine, or tangent of an angle**.## What is an example of trigonometric identities?

For example,

**sin θ = 1/ cosec θ or sin θ x cosec θ = 1**.**cos θ = 1/ sec θ or cos θ x sec θ = 1**.**tan θ = 1/cot θ or tan θ x cot θ = 1**.## What are the 45 formulas of trigonometry?

Trigonometry Table

Angles (In Degrees) | 0° | 45° |
---|---|---|

sin | 0 | 1/√2 |

cos | 1 | 1/√2 |

tan | 0 | 1 |

cot | ∞ | 1 |

## What are the 3 basic trigonometric identities?

Sine, tangent, cotangent, and cosecant are odd functions while cosine and secant are even functions. Ptolemy’s identities, the sum and difference formulas for sine and cosine.

## How do you find the sum of two angles?

The sum of angles formula is given as

**( n − 2) × 180°**. Here n denotes the number of sides of a polygon.## How do you find the SSS triangle?

## What is the formula for sum of cubes?

The sum of cubes formula is one of the important algebraic identity. It is represented by a

^{3}+ b^{3}and is read as a cube plus b cube. The sum of cubes (a^{3}+ b^{3}) formula is expressed as**a**.^{3}+ b^{3}= (a + b) (a^{2}– ab + b^{2})## How do you solve double angle identities?

## What are examples of SSS?

SSS (Side-Side-Side)

**If all the three sides of one triangle are equivalent to the corresponding three sides of the second triangle, then the two triangles are said to be congruent by SSS rule**. In the above-given figure, AB= PQ, BC = QR and AC=PR, hence Δ ABC ≅ Δ PQR.

## Can you solve SSS?

To solve an SSS triangle:

**use The Law of Cosines first to calculate one of the angles**.**then use The Law of Cosines again to find another angle**.**and finally use angles of a triangle add to 180° to find the last angle**.## What is an SSA triangle?

The acronym SSA (side-side-angle) refers to

**the criterion of congruence of two triangles**: if two sides and an angle not include between them are respectively equal to two sides and an angle of the other then the two triangles are equal.## What does SSS look like in geometry?

SSS stands for “side, side, side” and means that we have

**two triangles with all three sides equal**. If three sides of one triangle are equal to three sides of another triangle, the triangles are congruent.## What is SAS ASA and SSS congruence postulates?

Two or more triangles are congruent if the sides and angles of one triangle are equal to the sides and angles of another triangle. The congruency can also be tested by three postulates shown in the lesson: ASA (angle-side-angle), SAS (side-angle-side), and SSS (side-side-side).