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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.
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.
How to find the value of cos 120 °? 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.
2 days ago · How to Find Value of Cos 120 Degree? 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.
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 \(\cos \left(\frac{2\pi }{3}\right)\) or cos (2.0943951). Whenever the value of any angle is to be specified in radians, we need to multiply it with \(\frac{\pi}{180}\).
Jul 21, 2024 · Simply type the angle – in degrees or radians – and you'll find the cosine value instantly. Read on to understand what is a cosine and to find the cosine definition, as well as a neat table with cosine values for basic angles, such as cos 0°, cos 30°, or cos 45°.
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.
