## What is the most important identity in trigonometry?

The Pythagorean formula for sines and cosines. This is probably the most important trig identity.

## What is cos 2x identity?

cos(2x) = cos^2(x) – sin^2(x) = 2 cos^2(x) – 1 = 1 – 2 sin^2(x) tan(2x) = 2 tan(x) / (1 – tan^2(x)) sin^2(x) = 1/2 – 1/2 cos(2x) cos^2(x) = 1/2 + 1/2 cos(2x) sin x – sin y = 2 sin( (x – y)/2 ) cos( (x + y)/2 )

**What are the three trigonometry identities?**

The three main functions in trigonometry are Sine, Cosine and Tangent.

**Why is trigonometry important in real life?**

Trigonometry can be used to roof a house, to make the roof inclined ( in the case of single individual bungalows) and the height of the roof in buildings etc. It is used naval and aviation industries. It is used in cartography (creation of maps). Also trigonometry has its applications in satellite systems.

### Who invented trigonometry in India?

Bhaskara II

### Is sin 1 the same as CSC?

cosecant is the reciprical of the sin function or 1/sin(x) so that csc(x)*sin(x) = 1 when it is defined. The two can be confused since arcsin(x) is often denoted as sin^-1(x) and x^-1 is 1/x.

**What are the six trigonometric functions?**

There are six trigonometric ratios, sine, cosine, tangent, cosecant, secant and cotangent. These six trigonometric ratios are abbreviated as sin, cos, tan, csc, sec, cot.

**Is cot cos a sin?**

tan x = sin x cos x . 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 .

#### Is Cos Sin Tan?

Sin is equal to the side opposite the angle that you are conducting the functions on over the hypotenuse which is the longest side in the triangle. Cos is adjacent over hypotenuse. And tan is opposite over adjacent, which means tan is sin/cos.

#### Who is the father of trigonometry in India?

Aryabhata I

**What is CSC trigonometry?**

In a right angled triangle, the cosecant of an angle is: The length of the hypotenuse divided by the length of the side opposite the angle. The abbreviation is csc. csc θ = hypotenuse / opposite. It is not commonly used, and is equal to 1/sine.

**What is the point of trigonometry?**

Trigonometry helps us find angles and distances, and is used a lot in science, engineering, video games, and more!

## What is CSC in terms of sin?

The cosecant ( csc ) (\csc) (csc) The cosecant is the reciprocal of the sine. It is the ratio of the hypotenuse to the side opposite a given angle in a right triangle.

## Why was trigonometry invented?

Astronomy was the driving force behind advancements in trigonometry. Most of the early advancements in trigonometry were in spherical trigonometry mostly because of its application to astronomy. The three main figures that we know of in the development of Greek trigonometry are Hipparchus, Menelaus, and Ptolomy.

**Where is trigonometry used in real life?**

Trigonometry Applications in Real Life

- Trigonometry to Measure Height of a Building or a Mountain. Trigonometry is used in measuring the height of a building or a mountain.
- Trigonometry in Aviation.
- Trigonometry in Criminology.
- Trigonometry in Marine Biology.
- Trigonometry in Navigation.

**How do you learn trigonometry?**

Learn Trigonometry in 5 steps

- Step 1: Review your all basics.
- Step 2: Start with the right angle triangles.
- Example: A right angle have two sides 5 cm and 3 cm find the hypotenuse.
- Using Pythagoras theorem.
- Step 4: Learn the other important function of trigonometry.
- Step 5: Practice is the key for any branch of mathematics.