Cos 40 degrees in radians is written as cos (40° × π/180°), i.e., cos (2π/9) or cos (0.698131. . .). In this article, we will discuss the methods to find the value of cos 40 degrees with examples.

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Keep calm and read the result – in our case, cos(40°) ≈ 0.766 (remember, it's an approximate value; an exact cosine value can be found only for specific cases). Give this cosine calculator a go! Play around by typing the cosine value and finding the angle.

k = ...,-2,-1,0,1,2,... Cosine calculator online. cos (x) calculator.

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Free math problem solver answers your algebra, geometry, trigonometry, calculus, and statistics homework questions with step-by-step explanations, just like a math tutor.

Use our cos (x) calculator to find the cosine of 40 degrees - cos (40 °) - or the cosine of any angle in degrees and in radians.