# Quick Answer: What Is The Formula Of 1 Cos2x?

## What is cos2x COSX?

cos2x = cosx.

cos2x = cos(x+x) = cos^2x-sin^2x.

cos2x = cos^2x-(1-cos^2x) cos2x = 2cos^2x-1..

## Who is the father of trigonometry?

HipparchusThe first trigonometric table was apparently compiled by Hipparchus, who is consequently now known as “the father of trigonometry”.

## What is the value of 1 cos2x?

Thus,1-cos2x=2sin²x.

## How do you solve for cos2x?

The solutions to cos(2x) – cos(x) = 0 are x=2π3+2πkorx=2πk x = 2 π 3 + 2 π k o r x = 2 π k , where k is any integer.

## Where is trigonometry used?

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.

## What is sin 2x equal to?

1. sin(2x)=2sin(x)cos(x).

## What is SEC equal to?

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 .

## What is the formula for 1 cos 2x?

Cos2x is a double angle trigonometry that has the espansion of cos2x = cos^2(x) -sin^2(x) but you know that sin^2(x) + cos^2(x) = 1.

## What is the formula of 1 sin 2x?

1+sin2x = 1+2sinxcosx = sin^2x + cos^2x + 2sinxcosx = (sinx + cosx)^2 = an alternate way of expressing 1+sin2x -> if this is what you were looking for.

## 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 formula for cos 3x?

The formula of cos(3x) is 4 cos^3(x) -3 cos(x).

## Who found trigonometry?

Hipparchus of NicaeaThe first trigonometric table was apparently compiled by Hipparchus of Nicaea (180 – 125 BCE), who is now consequently known as “the father of trigonometry.” Hipparchus was the first to tabulate the corresponding values of arc and chord for a series of angles.

## What is tan 2x equal to?

Again, depending on where the x/2 within the Unit Circle, use the positive and negative sign accordingly. tan x/2 = sin x/ (1 + cos x) 1st easy equation tan x/2 = (1 – cos x) /sin x 2nd easy equation.

## What is formula of sin theta?

If θ is one of the acute angles in a triangle, then the sine of theta is the ratio of the opposite side to the hypotenuse, the cosine is the ratio of the adjacent side to the hypotenuse, and the tangent is the ratio of the opposite side to the adjacent side.