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Learn how to find the value of cos 120 using two angles, 90 and 180 degrees, and their cosine functions. See the trigonometric table for other angles and their values, and test your knowledge with a quiz.
Learn how to find the value of cos 120 degrees using the unit circle, trigonometric functions, and identities. See examples of cos 120 degrees in different expressions and FAQs.
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.
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.
Jul 7, 2024 · Enter the angle in degrees or radians and get the cosine value instantly. Learn the cosine definition, graph, table, and properties, and see examples of how to use the cosine calculator.
Feb 17, 2017 · Learn what is cos 120°, how to calculate it in degrees and radians, and what are the identities and formulas involving it. Use the cosine calculator to find cos 120° with higher accuracy and explore the trigonometric significance of cos 120°.
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.