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    Cos 145 Degrees

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

    What is cos 145°?

    Answer

    cos 145° ≈
    −0.8192

    Angle in radians: 145° = 29π/36. The point of the angle is in quadrant II, where cosine is negative.

    ≈ — rounded to 4 decimal places. cos 145° can't be written with square roots: 145° is not a multiple of 3°.

    cos 145° = cos(180° − 35°) = −cos 35° ≈ −0.8192

    P(cos 145°, sin 145°) ≈ (−0.8192, 0.5736)

    xyOP

    P(cos 145°, sin 145°) ≈ (−0.8192, 0.5736)

    Highlighted: the projection on the x-axis — cosine, x ≈ −0.8192.

    All four functions of 145°
    FunctionExact valueDecimal
    sin 145°—≈ 0.5736
    cos 145°—≈ −0.8192
    tan 145°—≈ −0.7002
    cot 145°—≈ −1.4281

    Reference angle: cos 35° ≈ 0.8192

    See Also

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    https://calculat.io/en/number/trigonometry/cos--145Copy
    <a href="https://calculat.io/en/number/trigonometry/cos--145">Cos 145 Degrees: Cosine of 145° on the Unit Circle</a>Copy
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    Cos 145 Degrees: Cosine of 145° on the Unit Circle. cos 145° ≈ −0.8192. The cosine is the x-coordinate of the point at 145° on the unit circle; 145° reduces to 35°.
    https://calculat.io/en/number/trigonometry/cos--145/generated.jpgCopy

    Cosine of nearby angles

    Anglecos
    140°≈ −0.7660
    142°≈ −0.7880
    144°−(√5 + 1)/4
    145°≈ −0.8192
    150°−√3/2
    159°≈ −0.9336
    160°≈ −0.9397
    Recalculate with different values ↑

    FAQ

    What is cos 145°?

    cos 145° ≈ −0.8192

    Why does cos 145° 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°. 145° is not, so no such exact form exists; the value is used as a decimal: cos 145° ≈ −0.8192.

    Why does a calculator show 0.8839 for cos 145?

    The calculator is in radian mode (RAD): it takes cos 145 as the cosine of 145 radians, cos 145 rad ≈ 0.8839. Switch it to degrees (DEG): cos 145° ≈ −0.8192. In radians the value is never undefined: π is irrational, so a whole number of radians never lands exactly on an axis.

    See Also