
What is cos 2x?
Cos(2x) is a trigonometric ratio of an angle in a right triangle representing the relationship between the angle and length of its sides. It is also demonstrated as Cosine(2x), or double angle formulae, as it has a double angle in it.

What is trigonometry formulae?
Trigonometry formulas are the basic formulas that use the rightangled triangle as a reference to derive the trigonometric functions or identities. The 6 trigonometric functions are cosine, sine, secant, cosecant, tangent, and cotangent. Simultaneously, three functions are commonly used in trigonometry, including sine, cosine, and tangent. All the trigonometrical concepts are based on these functions.

How is cos(2x) represented?
cos(2x) = cos^2(x) – sin^2(x) = 2 cos^2(x)1 = 12 sin^2(x) tan (2x) = 2 tan(x)/(1 tan^2(x)) sin^2(x) = 1/2–1/2 cos(2x)

What is the derivative of cos 2x?
The process of finding the derivative of cos(2x) uses the chain rule, which is
2sin(2x). 
What are the formulas of (cos2X)?
Cos 2t = cos2t sin2t
Because the angle is getting doubled, it is also called double angle formulae.

What is cos(2x) equivalent to?
cos(2x) is equivalent to 2cos2(x)1, which is equal to 2(0.4)2= 0.68

How the double angle formulae of cos2t is derived?
Before we know how to derive the double angle formulae of cos 2t, let’s start by considering the additional formulae:
Cos (A+B) = cos A cos B sin A sin B (in which A=B)
It makes the first of these formulas as cos (t+t) = cos t cos t – sin t sin t
Based on the above formulae, it makes: cos 2t = cos2t – sin2t
And, this is the reason it is called a double angle formulae (as in 2A)

Who is the father of trigonometry?
Hipparchus of Nicaea was the founder of trigonometry, who is also very popular for his magnificent discovery of the equinoxes’ precession. Hipparchus was a Greek philosopher, mathematician, and geographer (c. 190 BC – c. 120 BC). (See What are the diameters of Domino’s large, medium, and regularsized pizzas?)

How was trigonometry found?
The father of trigonometry ‘Hipparchus of Nicaea’ compiled the first trigonometric table and tabulated the corresponding values of arc and chord for a series of angles.

How is trigonometry used?
Trigonometry facilitates finding the angles and distances of objects. It is primarily focused on the triangles at 90 degrees, which is called the rightangled triangle depicting that all sides of the triangle cannot admeasure the same length.
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