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    Sin 142 Degrees

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

    What is sin 142°?

    Answer

    sin 142° ≈
    0.6157

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

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

    sin 142° = sin(180° − 38°) = sin 38° ≈ 0.6157

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

    xyOP

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

    Highlighted: the projection on the y-axis — sine, y ≈ 0.6157.

    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: sin 38° ≈ 0.6157

    See Also

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    https://calculat.io/en/number/trigonometry/sin--142Copy
    <a href="https://calculat.io/en/number/trigonometry/sin--142">Sin 142 Degrees: Sine of 142° on the Unit Circle</a>Copy
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    Sin 142 Degrees: Sine of 142° on the Unit Circle. sin 142° ≈ 0.6157. The sine is the y-coordinate of the point at 142° on the unit circle; 142° reduces to 38°.
    https://calculat.io/en/number/trigonometry/sin--142/generated.jpgCopy

    Sine of nearby angles

    Anglesin
    134°≈ 0.7193
    135°√2/2
    140°≈ 0.6428
    142°≈ 0.6157
    144°√(10 − 2√5)/4
    145°≈ 0.5736
    150°1/2
    Recalculate with different values ↑

    FAQ

    What is sin 142°?

    sin 142° ≈ 0.6157

    Why does sin 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: sin 142° ≈ 0.6157.

    Why does a calculator show −0.5878 for sin 142?

    The calculator is in radian mode (RAD): it takes sin 142 as the sine of 142 radians, sin 142 rad ≈ −0.5878. Switch it to degrees (DEG): sin 142° ≈ 0.6157. In radians the value is never undefined: π is irrational, so a whole number of radians never lands exactly on an axis.

    See Also