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    Tan 98 Degrees

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

    What is tan 98°?

    Answer

    tan 98° ≈
    −7.1154

    Angle in radians: 98° = 49π/90. The point of the angle is in quadrant II, where tangent is negative.

    ≈ — rounded to 4 decimal places. tan 98° can't be written with square roots: 98° is not a multiple of 3°.

    tan 98° = tan(180° − 82°) = −tan 82° ≈ −7.1154

    tan 98° = sin 98° / cos 98° ≈ −7.1154

    xyOP

    P(cos 98°, sin 98°) ≈ (−0.1392, 0.9903)

    T(1, tan 98°) ≈ (1, −7.1154) — where line OP meets the line x = 1, on the extension of the ray beyond O (dashed); T is beyond the drawing, the arrow points to it.

    All four functions of 98°
    FunctionExact valueDecimal
    sin 98°—≈ 0.9903
    cos 98°—≈ −0.1392
    tan 98°—≈ −7.1154
    cot 98°—≈ −0.1405

    Reference angle: tan 82° ≈ 7.1154

    See Also

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    https://calculat.io/en/number/trigonometry/tan--98Copy
    <a href="https://calculat.io/en/number/trigonometry/tan--98">Tan 98 Degrees: Tangent of 98° on the Unit Circle</a>Copy
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    Tan 98 Degrees: Tangent of 98° on the Unit Circle. tan 98° ≈ −7.1154. The tangent is the ratio y/x of the point at 98° on the unit circle; 98° reduces to 82°.
    https://calculat.io/en/number/trigonometry/tan--98/generated.jpgCopy

    Tangent of nearby angles

    Angletan
    89°≈ 57.2900
    90°undefined
    97°≈ −8.1443
    98°≈ −7.1154
    100°≈ −5.6713
    101°≈ −5.1446
    105°−2 − √3
    Recalculate with different values ↑

    FAQ

    What is tan 98°?

    tan 98° ≈ −7.1154

    Why does tan 98° 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°. 98° is not, so no such exact form exists; the value is used as a decimal: tan 98° ≈ −7.1154.

    Why does a calculator show 0.6999 for tan 98?

    The calculator is in radian mode (RAD): it takes tan 98 as the tangent of 98 radians, tan 98 rad ≈ 0.6999. Switch it to degrees (DEG): tan 98° ≈ −7.1154. In radians the value is never undefined: π is irrational, so a whole number of radians never lands exactly on an axis.

    See Also