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    Cos 70 Degrees

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

    What is cos 70°?

    Answer

    cos 70° ≈
    0.3420

    Angle in radians: 70° = 7π/18. The point of the angle is in quadrant I, where cosine is positive.

    ≈ — rounded to 4 decimal places. cos 70° can't be written with square roots: 70° is not a multiple of 3°.

    P(cos 70°, sin 70°) ≈ (0.3420, 0.9397)

    xyOP

    P(cos 70°, sin 70°) ≈ (0.3420, 0.9397)

    Highlighted: the projection on the x-axis — cosine, x ≈ 0.3420.

    All four functions of 70°
    FunctionExact valueDecimal
    sin 70°—≈ 0.9397
    cos 70°—≈ 0.3420
    tan 70°—≈ 2.7475
    cot 70°—≈ 0.3640

    See Also

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    https://calculat.io/en/number/trigonometry/cos--70Copy
    <a href="https://calculat.io/en/number/trigonometry/cos--70">Cos 70 Degrees: Cosine of 70° on the Unit Circle</a>Copy
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    Cos 70 Degrees: Cosine of 70° on the Unit Circle. cos 70° ≈ 0.3420. The cosine is the x-coordinate of the point at 70° on the unit circle.
    https://calculat.io/en/number/trigonometry/cos--70/generated.jpgCopy

    Cosine of nearby angles

    Anglecos
    67°≈ 0.3907
    68°≈ 0.3746
    69°≈ 0.3584
    70°≈ 0.3420
    71°≈ 0.3256
    72°(√5 − 1)/4
    73°≈ 0.2924
    Recalculate with different values ↑

    FAQ

    What is cos 70°?

    cos 70° ≈ 0.3420

    Why does cos 70° 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°. 70° is not, so no such exact form exists; the value is used as a decimal: cos 70° ≈ 0.3420.

    Why does a calculator show 0.6333 for cos 70?

    The calculator is in radian mode (RAD): it takes cos 70 as the cosine of 70 radians, cos 70 rad ≈ 0.6333. Switch it to degrees (DEG): cos 70° ≈ 0.3420. In radians the value is never undefined: π is irrational, so a whole number of radians never lands exactly on an axis.

    See Also