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. The exact value of cos(30) cos (30) is √3 2 3 2. The result can be shown in multiple forms. −0.86602540… - …

Cos 870 degrees is the value of cosine trigonometric function for an angle equal to 870 degrees. The value of cos 870° is −√3/2 or -0.866 (approx) How to Find the Value of Cos 870 Degrees?

Rewrite 870∘ as 360∘ ⋅ 2+150∘ = cos(360∘2+150∘) Apply the periodicity of cos: cos(x+360∘ ⋅ k) =cos(x) cos(360∘ ⋅ 2+150∘) =cos(150∘) = cos(150∘) = cos(150∘) = − 23. What is the value of …

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Preliminaries Values of sin and cos for special angles between 0 and 360 (between 0 and 2 radians). Objectives Find values for sin and cos for angles larger than 360 (larger than 2 ). Find values for sin and cos for negative angles. p2 ; p2. From the original angle, repeatedly subtract 360 until arriving at an angle between 0 and 360 .