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    Cos 88 Degrees

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

    What is cos 88°?

    Answer

    cos 88° ≈
    0.0349

    Angle in radians: 88° = 22π/45. The point of the angle is in quadrant I, where cosine is positive.

    ≈ — rounded to 4 decimal places. cos 88° can't be written with square roots: 88° is not a multiple of 3°.

    P(cos 88°, sin 88°) ≈ (0.0349, 0.9994)

    xyOP

    P(cos 88°, sin 88°) ≈ (0.0349, 0.9994)

    Highlighted: the projection on the x-axis — cosine, x ≈ 0.0349.

    All four functions of 88°
    FunctionExact valueDecimal
    sin 88°—≈ 0.9994
    cos 88°—≈ 0.0349
    tan 88°—≈ 28.6363
    cot 88°—≈ 0.0349

    See Also

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    https://calculat.io/en/number/trigonometry/cos--88Copy
    <a href="https://calculat.io/en/number/trigonometry/cos--88">Cos 88 Degrees: Cosine of 88° on the Unit Circle</a>Copy
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    Cos 88 Degrees: Cosine of 88° on the Unit Circle. cos 88° ≈ 0.0349. The cosine is the x-coordinate of the point at 88° on the unit circle.
    https://calculat.io/en/number/trigonometry/cos--88/generated.jpgCopy

    Cosine of nearby angles

    Anglecos
    85°≈ 0.0872
    86°≈ 0.0698
    87°≈ 0.0523
    88°≈ 0.0349
    89°≈ 0.0175
    90°0
    97°≈ −0.1219
    Recalculate with different values ↑

    FAQ

    What is cos 88°?

    cos 88° ≈ 0.0349

    Why does cos 88° 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°. 88° is not, so no such exact form exists; the value is used as a decimal: cos 88° ≈ 0.0349.

    Why does a calculator show 0.9994 for cos 88?

    The calculator is in radian mode (RAD): it takes cos 88 as the cosine of 88 radians, cos 88 rad ≈ 0.9994. Switch it to degrees (DEG): cos 88° ≈ 0.0349. In radians the value is never undefined: π is irrational, so a whole number of radians never lands exactly on an axis.

    See Also