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    Cot 90 Degrees

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

    What is cot 90°?

    Answer

    cot 90° =
    0

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

    cot 90° = cos 90° / sin 90° = 0 / 1 = 0

    xyOP

    P(cos 90°, sin 90°) = (0, 1)

    C(cot 90°, 1) = (0, 1) — where line OP meets the line y = 1.

    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/cot--90Copy
    <a href="https://calculat.io/en/number/trigonometry/cot--90">Cot 90 Degrees: Cotangent of 90° on the Unit Circle</a>Copy
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    Cot 90 Degrees: Cotangent of 90° on the Unit Circle. cot 90° = 0. The cotangent is the ratio x/y of the point at 90° on the unit circle.
    https://calculat.io/en/number/trigonometry/cot--90/generated.jpgCopy

    Cotangent of nearby angles

    Anglecot
    87°≈ 0.0524
    88°≈ 0.0349
    89°≈ 0.0175
    90°0
    97°≈ −0.1228
    98°≈ −0.1405
    100°≈ −0.1763
    Recalculate with different values ↑

    FAQ

    What is cot 90°?

    cot 90° = 0

    Why is cot 90° equal to 0?

    The point of 90° on the unit circle is (0, 1), and cot = x / y = 0 / 1 = 0.

    Why does a calculator show −0.5012 for cot 90?

    The calculator is in radian mode (RAD): it takes cot 90 as the cotangent of 90 radians, cot 90 rad ≈ −0.5012. Switch it to degrees (DEG): cot 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