Feedback form
Hi! What do you think?

Drag it here or paste with Ctrl+V

    You can also email us on infocalculat.io

    Cos 65 Degrees

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

    What is cos 65°?

    Answer

    cos 65° ≈
    0.4226

    Angle in radians: 65° = 13π/36. The point of the angle is in quadrant I, where cosine is positive.

    ≈ — rounded to 4 decimal places. cos 65° can't be written with square roots: 65° is not a multiple of 3°.

    P(cos 65°, sin 65°) ≈ (0.4226, 0.9063)

    xyOP

    P(cos 65°, sin 65°) ≈ (0.4226, 0.9063)

    Highlighted: the projection on the x-axis — cosine, x ≈ 0.4226.

    All four functions of 65°
    FunctionExact valueDecimal
    sin 65°—≈ 0.9063
    cos 65°—≈ 0.4226
    tan 65°—≈ 2.1445
    cot 65°—≈ 0.4663

    See Also

    Share This Calculation
    Print
    https://calculat.io/en/number/trigonometry/cos--65Copy
    <a href="https://calculat.io/en/number/trigonometry/cos--65">Cos 65 Degrees: Cosine of 65° on the Unit Circle</a>Copy
    Facebook
    Twitter
    Telegram
    WhatsApp
    Viber
    Email
    Cos 65 Degrees: Cosine of 65° on the Unit Circle. cos 65° ≈ 0.4226. The cosine is the x-coordinate of the point at 65° on the unit circle.
    https://calculat.io/en/number/trigonometry/cos--65/generated.jpgCopy

    Cosine of nearby angles

    Anglecos
    62°≈ 0.4695
    63°≈ 0.4540
    64°≈ 0.4384
    65°≈ 0.4226
    66°≈ 0.4067
    67°≈ 0.3907
    68°≈ 0.3746
    Recalculate with different values ↑

    FAQ

    What is cos 65°?

    cos 65° ≈ 0.4226

    Why does cos 65° 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°. 65° is not, so no such exact form exists; the value is used as a decimal: cos 65° ≈ 0.4226.

    Why does a calculator show −0.5625 for cos 65?

    The calculator is in radian mode (RAD): it takes cos 65 as the cosine of 65 radians, cos 65 rad ≈ −0.5625. Switch it to degrees (DEG): cos 65° ≈ 0.4226. In radians the value is never undefined: π is irrational, so a whole number of radians never lands exactly on an axis.

    See Also