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    Cos 89 Degrees

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

    What is cos 89°?

    Answer

    cos 89° ≈
    0.0175

    Angle in radians: 89° = 89π/180. The point of the angle is in quadrant I, where cosine is positive.

    ≈ — rounded to 4 decimal places. cos 89° can't be written with square roots: 89° is not a multiple of 3°.

    P(cos 89°, sin 89°) ≈ (0.0175, 0.9998)

    xyOP

    P(cos 89°, sin 89°) ≈ (0.0175, 0.9998)

    Highlighted: the projection on the x-axis — cosine, x ≈ 0.0175.

    All four functions of 89°
    FunctionExact valueDecimal
    sin 89°—≈ 0.9998
    cos 89°—≈ 0.0175
    tan 89°—≈ 57.2900
    cot 89°—≈ 0.0175

    See Also

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    https://calculat.io/en/number/trigonometry/cos--89Copy
    <a href="https://calculat.io/en/number/trigonometry/cos--89">Cos 89 Degrees: Cosine of 89° on the Unit Circle</a>Copy
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    Cos 89 Degrees: Cosine of 89° on the Unit Circle. cos 89° ≈ 0.0175. The cosine is the x-coordinate of the point at 89° on the unit circle.
    https://calculat.io/en/number/trigonometry/cos--89/generated.jpgCopy

    Cosine of nearby angles

    Anglecos
    86°≈ 0.0698
    87°≈ 0.0523
    88°≈ 0.0349
    89°≈ 0.0175
    90°0
    97°≈ −0.1219
    98°≈ −0.1392
    Recalculate with different values ↑

    FAQ

    What is cos 89°?

    cos 89° ≈ 0.0175

    Why does cos 89° 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°. 89° is not, so no such exact form exists; the value is used as a decimal: cos 89° ≈ 0.0175.

    Why does a calculator show 0.5102 for cos 89?

    The calculator is in radian mode (RAD): it takes cos 89 as the cosine of 89 radians, cos 89 rad ≈ 0.5102. Switch it to degrees (DEG): cos 89° ≈ 0.0175. In radians the value is never undefined: π is irrational, so a whole number of radians never lands exactly on an axis.

    See Also