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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.
5 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.
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.
5 days ago · 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°.
cos (120) cos ( 120) Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. Make the expression negative because cosine is negative in the second quadrant. −cos(60) - cos ( 60) The exact value of cos(60) cos ( 60) is 1 2 1 2. −1 2 - 1 2.
Feb 17, 2017 · If you want to know what is cos 120 degrees in terms of trigonometry, then navigate straight to the explanations in the next paragraph; what’s ahead in this section is the value of cos 120°: cos120° = -0.5
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.
Jan 24, 2023 · In order to find the value of cos 120 °, students need to draw a right-angled triangle (refer to the image below) and can use either of the two formulas i.e, cos (180° – θ) = – cosθ. or. cos (90° + θ) = – sinθ.
