# Frequent question: What is the formula of COS 3 Theta?

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The formula of cos of three times of theta is given by: Cos 3θ = 4cos3θ – 3cos θ

## What is the range of cos 3x?

The range is −1≤y≤1 – 1 ≤ y ≤ 1 .

## What is the formula of cos 4x?

By using the cosine addition formula, the cosine of both the sum and difference of two angles can be found with the two angles’ sines and cosines. Hence, the formula [cos 4x = 8{cos ^4}x – 8{cos ^2}x + 1].

## What is cos2x formula?

Now if you are wondering what the formula of cos2x is, let me tell you that we have 5 cos x formula. The trigonometric formula of cos2x = Cos²x – Sin²x. The trigonometric formula of cos2x = 1 – 2Sin²x. The trigonometric formula of cos2x = 2Cos²x – 1. The trigonometric formula of cos2x = 1−tan2x1+tan2x.

## What is sin 45 degrees?

Sin 45 Degrees

The value of Sin 45 degree in decimal form is 0.7071067812. Sine is considered as one of the most important functions in trigonometry as it is used to find out the unknown values of the angles and length of the sides of a right-angle triangle.

## What is COSX?

The arccosine of x is defined as the inverse cosine function of x when -1≤x≤1. When the cosine of y is equal to x: cos y = x. Then the arccosine of x is equal to the inverse cosine function of x, which is equal to y: arccos x = cos1 x = y.

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## How do you solve sin3X 3sinx 4sin 3x? 