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    Cos 142 Degrees

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

    What is cos 142°?

    Answer

    cos 142° ≈
    −0.7880

    Angle in radians: 142° = 71π/90. The point of the angle is in quadrant II, where cosine is negative.

    ≈ — rounded to 4 decimal places. cos 142° can't be written with square roots: 142° is not a multiple of 3°.

    cos 142° = cos(180° − 38°) = −cos 38° ≈ −0.7880

    P(cos 142°, sin 142°) ≈ (−0.7880, 0.6157)

    xyOP

    P(cos 142°, sin 142°) ≈ (−0.7880, 0.6157)

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

    All four functions of 142°
    FunctionExact valueDecimal
    sin 142°—≈ 0.6157
    cos 142°—≈ −0.7880
    tan 142°—≈ −0.7813
    cot 142°—≈ −1.2799

    Reference angle: cos 38° ≈ 0.7880

    See Also

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    https://calculat.io/en/number/trigonometry/cos--142Copy
    <a href="https://calculat.io/en/number/trigonometry/cos--142">Cos 142 Degrees: Cosine of 142° on the Unit Circle</a>Copy
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    Cos 142 Degrees: Cosine of 142° on the Unit Circle. cos 142° ≈ −0.7880. The cosine is the x-coordinate of the point at 142° on the unit circle; 142° reduces to 38°.
    https://calculat.io/en/number/trigonometry/cos--142/generated.jpgCopy

    Cosine of nearby angles

    Anglecos
    134°≈ −0.6947
    135°−√2/2
    140°≈ −0.7660
    142°≈ −0.7880
    144°−(√5 + 1)/4
    145°≈ −0.8192
    150°−√3/2
    Recalculate with different values ↑

    FAQ

    What is cos 142°?

    cos 142° ≈ −0.7880

    Why does cos 142° 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°. 142° is not, so no such exact form exists; the value is used as a decimal: cos 142° ≈ −0.7880.

    Why does a calculator show −0.8090 for cos 142?

    The calculator is in radian mode (RAD): it takes cos 142 as the cosine of 142 radians, cos 142 rad ≈ −0.8090. Switch it to degrees (DEG): cos 142° ≈ −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