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    Cos 86 Degrees

    Sin, Cos, Tan, Cot of an Angle
    Function
    Angle (°)

    What is cos 86°?

    Answer

    cos 86° ≈
    0.0698

    Angle in radians: 86° = 43π/90. The point of the angle is in quadrant I, where cosine is positive.

    ≈ — rounded to 4 decimal places. cos 86° can't be written with square roots: 86° is not a multiple of 3°.

    P(cos 86°, sin 86°) ≈ (0.0698, 0.9976)

    xyOP

    P(cos 86°, sin 86°) ≈ (0.0698, 0.9976)

    Highlighted: the projection on the x-axis — cosine, x ≈ 0.0698.

    All four functions of 86°
    FunctionExact valueDecimal
    sin 86°—≈ 0.9976
    cos 86°—≈ 0.0698
    tan 86°—≈ 14.3007
    cot 86°—≈ 0.0699

    See Also

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    https://calculat.io/en/number/trigonometry/cos--86Copy
    <a href="https://calculat.io/en/number/trigonometry/cos--86">Cos 86 Degrees: Cosine of 86° on the Unit Circle</a>Copy
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    Cos 86 Degrees: Cosine of 86° on the Unit Circle. cos 86° ≈ 0.0698. The cosine is the x-coordinate of the point at 86° on the unit circle.
    https://calculat.io/en/number/trigonometry/cos--86/generated.jpgCopy

    Cosine of nearby angles

    Anglecos
    83°≈ 0.1219
    84°≈ 0.1045
    85°≈ 0.0872
    86°≈ 0.0698
    87°≈ 0.0523
    88°≈ 0.0349
    89°≈ 0.0175
    Recalculate with different values ↑

    FAQ

    What is cos 86°?

    cos 86° ≈ 0.0698

    Why does cos 86° have no exact value?

    A trigonometric value of a whole number of degrees can be written with square roots only when the angle is a multiple of 3°. 86° is not, so no such exact form exists; the value is used as a decimal: cos 86° ≈ 0.0698.

    Why does a calculator show −0.3837 for cos 86?

    The calculator is in radian mode (RAD): it takes cos 86 as the cosine of 86 radians, cos 86 rad ≈ −0.3837. Switch it to degrees (DEG): cos 86° ≈ 0.0698. In radians the value is never undefined: π is irrational, so a whole number of radians never lands exactly on an axis.

    See Also