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    Cos 79 Degrees

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

    What is cos 79°?

    Answer

    cos 79° ≈
    0.1908

    Angle in radians: 79° = 79π/180. The point of the angle is in quadrant I, where cosine is positive.

    ≈ — rounded to 4 decimal places. cos 79° can't be written with square roots: 79° is not a multiple of 3°.

    P(cos 79°, sin 79°) ≈ (0.1908, 0.9816)

    xyOP

    P(cos 79°, sin 79°) ≈ (0.1908, 0.9816)

    Highlighted: the projection on the x-axis — cosine, x ≈ 0.1908.

    All four functions of 79°
    FunctionExact valueDecimal
    sin 79°—≈ 0.9816
    cos 79°—≈ 0.1908
    tan 79°—≈ 5.1446
    cot 79°—≈ 0.1944

    See Also

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    https://calculat.io/en/number/trigonometry/cos--79Copy
    <a href="https://calculat.io/en/number/trigonometry/cos--79">Cos 79 Degrees: Cosine of 79° on the Unit Circle</a>Copy
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    Cos 79 Degrees: Cosine of 79° on the Unit Circle. cos 79° ≈ 0.1908. The cosine is the x-coordinate of the point at 79° on the unit circle.
    https://calculat.io/en/number/trigonometry/cos--79/generated.jpgCopy

    Cosine of nearby angles

    Anglecos
    76°≈ 0.2419
    77°≈ 0.2250
    78°≈ 0.2079
    79°≈ 0.1908
    80°≈ 0.1736
    81°≈ 0.1564
    82°≈ 0.1392
    Recalculate with different values ↑

    FAQ

    What is cos 79°?

    cos 79° ≈ 0.1908

    Why does cos 79° 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°. 79° is not, so no such exact form exists; the value is used as a decimal: cos 79° ≈ 0.1908.

    Why does a calculator show −0.8960 for cos 79?

    The calculator is in radian mode (RAD): it takes cos 79 as the cosine of 79 radians, cos 79 rad ≈ −0.8960. Switch it to degrees (DEG): cos 79° ≈ 0.1908. In radians the value is never undefined: π is irrational, so a whole number of radians never lands exactly on an axis.

    See Also