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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.
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.
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.
3 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.
Jan 24, 2023 · The value of cos 120° is -1/2 or -0.5 as it lies in the 2nd quadrant where cosine is negative. The formula of cosine is, cos x = (adjacent side) / (hypotenuse). Here, the adjacent side is adjacent to angle x, and the hypotenuse is the triangle’s longest side.
Feb 17, 2017 · To obtain 120 degrees in radian multiply 120° by π / 180° = 2/3 π. Cos 120degrees = cos (2/3 × π). Our results of cos120° have been rounded to five decimal places. If you want cosine 120° with higher accuracy, then use the calculator below; our tool displays ten decimal places.
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.
Cosine is one of the most important functions of trigonometry which deals with the relationship between the angles and the sides of a right-angled triangle. Answer: The value of cos 120 degrees is -1/2.
May 4, 2023 · Value of cos 120 degrees is -0.5 or -1/2 & value of cos 120 in radians is cos(2π 3) or cos (2.0943951). It’s a trigonometric ratio that symbolizes a function in the second quadrant. As the value of cosine is negative in the second quadrant so cos 120 will have a negative value.
Exact Form: −1 2 - 1 2. Decimal Form: −0.5 - 0.5. Free math problem solver answers your algebra, geometry, trigonometry, calculus, and statistics homework questions with step-by-step explanations, just like a math tutor.
