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We can show that 120 degrees can be represented in two angles, whose value can be taken from trigonometry table. 90 degree and 180 degree. 180° – 60° = 120° ———– (1) 90° + 30° = 120° ———— (2) Let’s use these now. Cos 120° = cos(180° – 60°) = – cos 60° = -½ (since cos(180° – x) = – cos x)
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.
cos (120) cos ( 120) To convert degrees to radians, multiply by π 180° π 180 °, since a full circle is 360° 360 ° or 2π 2 π radians. 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.
Use this cos calculator to easily calculate the cosine of an angle given in degrees or radians. The cosine is encountered in geometry problems involving right triangles, circles, and others where cos(x) can be calculated.
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°.
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.
Use this simple cos calculator to calculate the cos value for 120° in radians / degrees. The Trignometric Table of sin, cos, tan, cosec, sec, cot is useful to learn the common angles of trigonometrical ratios from 0° to 360°.
