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    Cos 90 Degrees

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

    What is cos 90°?

    Answer

    cos 90° =
    0

    Angle in radians: 90° = π/2. The point of the angle is on the y-axis: (0, 1).

    P(cos 90°, sin 90°) = (0, 1)

    xyOP

    P(cos 90°, sin 90°) = (0, 1)

    The point lies on the y-axis, so its projection on the x-axis is 0: cos 90° = 0.

    All four functions of 90°
    FunctionExact valueDecimal
    sin 90°11
    cos 90°00
    tan 90°undefined—
    cot 90°00

    See Also

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    https://calculat.io/en/number/trigonometry/cos--90Copy
    <a href="https://calculat.io/en/number/trigonometry/cos--90">Cos 90 Degrees: Cosine of 90° on the Unit Circle</a>Copy
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    Cos 90 Degrees: Cosine of 90° on the Unit Circle. cos 90° = 0. The cosine is the x-coordinate of the point at 90° on the unit circle.
    https://calculat.io/en/number/trigonometry/cos--90/generated.jpgCopy

    Cosine of nearby angles

    Anglecos
    87°≈ 0.0523
    88°≈ 0.0349
    89°≈ 0.0175
    90°0
    97°≈ −0.1219
    98°≈ −0.1392
    100°≈ −0.1736
    Recalculate with different values ↑

    FAQ

    What is cos 90°?

    cos 90° = 0

    Why is cos 90° equal to 0?

    The point of 90° on the unit circle is (0, 1), and cosine is its the x-coordinate, so cos 90° = 0.

    Why does a calculator show −0.4481 for cos 90?

    The calculator is in radian mode (RAD): it takes cos 90 as the cosine of 90 radians, cos 90 rad ≈ −0.4481. Switch it to degrees (DEG): cos 90° = 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