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Value of Cos 120 degree can be calculated using other trigonometric angles 90 degrees and 180 degrees. These cosine values can be gained from the trigonometric table.
Solution. Find the value of cos 120 °. We know that. cos α + β = cos α cos β - sin α sin β. Now by substituting the value of α = 90 ° and β = 30 ° in the trigonometric identity we get. cos 90 ° + 30 ° = cos 90 ° cos 30 ° - sin 90 ° sin 30 ° ⇒ cos 90 ° + 30 ° = 0 - 1 × 1 2 ∵ cos 90 ° = 0, sin 90 ° = 1 and sin 30 ° = 1 2 ⇒ cos 120 ° = - 1 2.
The value of cos 120 degrees is -0.5. Cos 120 degrees in radians is written as cos (120° × π/180°), i.e., cos (2π/3) or cos (2.094395. . .). In this article, we will discuss the methods to find the value of cos 120 degrees with examples.
May 4, 2023 · What is Value of Cos 120? Value of cos 120 degrees is -0.5 or -1/2 & value of cos 120 in radians is cos(2π 3) cos. ( 2 π 3) or cos (2.0943951). Whenever the value of any angle is to be specified in radians, we need to multiply it with π 180 π 180. Using the same procedure, we can write cos 120 as cos (120 × π 180) cos. ( 120 × π 180).
4 days ago · Cos 120 degree is equal to minus half which can be written as (- ½ ) or (-0.5). Cos is one of the functions of Trigonometry that deals with the relationship between the angles and sides of a right-angled triangle. So in short, we can say that measuring a triangle (specifically right-angled triangle) is trigonometry.
Feb 17, 2017 · For the cosine of 120 degrees we use the abbreviation cos for the trigonometric function together with the degree symbol °, and write it as cos 120°. If you have been looking for what is cos 120°, or if you have been wondering about cos 120 degrees in radians, then you are right here, too.
Answer: The value of cos 120 degrees is -1/2. Let us find the value of cos 120°with the help of the trigonometry formulas. Explanation: Let us write 120° as a sum of 90° and 30°. Now we can apply the cos (a + b) formula: cos (a + b) = cos a cos b - sin a sin b.
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cos (120°) is exactly: -1/2. Note: angle unit is set to degrees. Use our cos (x) calculator to find the cosine of 120 degrees - cos (120 °) - or the cosine of any angle in degrees and in radians.
5 days ago · Example: how to use a cosine calculator. This cosine calculator is a twin tool to our sine calculator – add to them the tangent calculator, and you'll have a pack of the most popular trigonometric functions. Simply type the angle – in degrees or radians – and you'll find the cosine value instantly.
