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    Cos 38 Degrees

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

    What is cos 38°?

    Answer

    cos 38° ≈
    0.7880

    Angle in radians: 38° = 19π/90. The point of the angle is in quadrant I, where cosine is positive.

    ≈ — rounded to 4 decimal places. cos 38° can't be written with square roots: 38° is not a multiple of 3°.

    P(cos 38°, sin 38°) ≈ (0.7880, 0.6157)

    xyOP

    P(cos 38°, sin 38°) ≈ (0.7880, 0.6157)

    Highlighted: the projection on the x-axis — cosine, x ≈ 0.7880.

    All four functions of 38°
    FunctionExact valueDecimal
    sin 38°—≈ 0.6157
    cos 38°—≈ 0.7880
    tan 38°—≈ 0.7813
    cot 38°—≈ 1.2799

    See Also

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    https://calculat.io/en/number/trigonometry/cos--38Copy
    <a href="https://calculat.io/en/number/trigonometry/cos--38">Cos 38 Degrees: Cosine of 38° on the Unit Circle</a>Copy
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    Cos 38 Degrees: Cosine of 38° on the Unit Circle. cos 38° ≈ 0.7880. The cosine is the x-coordinate of the point at 38° on the unit circle.
    https://calculat.io/en/number/trigonometry/cos--38/generated.jpgCopy

    Cosine of nearby angles

    Anglecos
    35°≈ 0.8192
    36°(√5 + 1)/4
    37°≈ 0.7986
    38°≈ 0.7880
    39°≈ 0.7771
    40°≈ 0.7660
    41°≈ 0.7547
    Recalculate with different values ↑

    FAQ

    What is cos 38°?

    cos 38° ≈ 0.7880

    Why does cos 38° 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°. 38° is not, so no such exact form exists; the value is used as a decimal: cos 38° ≈ 0.7880.

    Why does a calculator show 0.9551 for cos 38?

    The calculator is in radian mode (RAD): it takes cos 38 as the cosine of 38 radians, cos 38 rad ≈ 0.9551. Switch it to degrees (DEG): cos 38° ≈ 0.7880. In radians the value is never undefined: π is irrational, so a whole number of radians never lands exactly on an axis.

    See Also