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    Sin 64 Degrees

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

    What is sin 64°?

    Answer

    sin 64° ≈
    0.8988

    Angle in radians: 64° = 16π/45. The point of the angle is in quadrant I, where sine is positive.

    ≈ — rounded to 4 decimal places. sin 64° can't be written with square roots: 64° is not a multiple of 3°.

    P(cos 64°, sin 64°) ≈ (0.4384, 0.8988)

    xyOP

    P(cos 64°, sin 64°) ≈ (0.4384, 0.8988)

    Highlighted: the projection on the y-axis — sine, y ≈ 0.8988.

    All four functions of 64°
    FunctionExact valueDecimal
    sin 64°—≈ 0.8988
    cos 64°—≈ 0.4384
    tan 64°—≈ 2.0503
    cot 64°—≈ 0.4877

    See Also

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    https://calculat.io/en/number/trigonometry/sin--64Copy
    <a href="https://calculat.io/en/number/trigonometry/sin--64">Sin 64 Degrees: Sine of 64° on the Unit Circle - Calculatio</a>Copy
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    Sin 64 Degrees: Sine of 64° on the Unit Circle. sin 64° ≈ 0.8988. The sine is the y-coordinate of the point at 64° on the unit circle.
    https://calculat.io/en/number/trigonometry/sin--64/generated.jpgCopy

    Sine of nearby angles

    Anglesin
    61°≈ 0.8746
    62°≈ 0.8829
    63°≈ 0.8910
    64°≈ 0.8988
    65°≈ 0.9063
    66°≈ 0.9135
    67°≈ 0.9205
    Recalculate with different values ↑

    FAQ

    What is sin 64°?

    sin 64° ≈ 0.8988

    Why does sin 64° 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°. 64° is not, so no such exact form exists; the value is used as a decimal: sin 64° ≈ 0.8988.

    Why does a calculator show 0.9200 for sin 64?

    The calculator is in radian mode (RAD): it takes sin 64 as the sine of 64 radians, sin 64 rad ≈ 0.9200. Switch it to degrees (DEG): sin 64° ≈ 0.8988. In radians the value is never undefined: π is irrational, so a whole number of radians never lands exactly on an axis.

    See Also