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    Cos 270 Degrees

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

    What is cos 270°?

    Answer

    cos 270° =
    0

    Angle in radians: 270° = 3π/2. The point of the angle is on the y-axis: (0, −1).

    P(cos 270°, sin 270°) = (0, −1)

    xyOP

    P(cos 270°, sin 270°) = (0, −1)

    The point lies on the y-axis, so its projection on the x-axis is 0: cos 270° = 0.

    All four functions of 270°
    FunctionExact valueDecimal
    sin 270°−1−1
    cos 270°00
    tan 270°undefined—
    cot 270°00

    Reference angle: cos 90° = 0

    See Also

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    https://calculat.io/en/number/trigonometry/cos--270Copy
    <a href="https://calculat.io/en/number/trigonometry/cos--270">Cos 270 Degrees: Cosine of 270° on the Unit Circle</a>Copy
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    Cos 270 Degrees: Cosine of 270° on the Unit Circle. cos 270° = 0. The cosine is the x-coordinate of the point at 270° on the unit circle.
    https://calculat.io/en/number/trigonometry/cos--270/generated.jpgCopy

    Cosine of nearby angles

    Anglecos
    240°−1/2
    252°−(√5 − 1)/4
    255°−(√6 − √2)/4
    270°0
    285°(√6 − √2)/4
    288°(√5 − 1)/4
    300°1/2
    Recalculate with different values ↑

    FAQ

    What is cos 270°?

    cos 270° = 0

    Why is cos 270° equal to 0?

    The point of 270° on the unit circle is (0, −1), and cosine is its the x-coordinate, so cos 270° = 0.

    Why does a calculator show 0.9844 for cos 270?

    The calculator is in radian mode (RAD): it takes cos 270 as the cosine of 270 radians, cos 270 rad ≈ 0.9844. Switch it to degrees (DEG): cos 270° = 0. In radians the value is never undefined: π is irrational, so a whole number of radians never lands exactly on an axis.

    See Also