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    Sin 98 Degrees

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

    What is sin 98°?

    Answer

    sin 98° ≈
    0.9903

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

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

    sin 98° = sin(180° − 82°) = sin 82° ≈ 0.9903

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

    xyOP

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

    Highlighted: the projection on the y-axis — sine, y ≈ 0.9903.

    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: sin 82° ≈ 0.9903

    See Also

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    https://calculat.io/en/number/trigonometry/sin--98Copy
    <a href="https://calculat.io/en/number/trigonometry/sin--98">Sin 98 Degrees: Sine of 98° on the Unit Circle - Calculatio</a>Copy
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    Sin 98 Degrees: Sine of 98° on the Unit Circle. sin 98° ≈ 0.9903. The sine is the y-coordinate of the point at 98° on the unit circle; 98° reduces to 82°.
    https://calculat.io/en/number/trigonometry/sin--98/generated.jpgCopy

    Sine of nearby angles

    Anglesin
    89°≈ 0.9998
    90°1
    97°≈ 0.9925
    98°≈ 0.9903
    100°≈ 0.9848
    101°≈ 0.9816
    105°(√6 + √2)/4
    Recalculate with different values ↑

    FAQ

    What is sin 98°?

    sin 98° ≈ 0.9903

    Why does sin 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: sin 98° ≈ 0.9903.

    Why does a calculator show −0.5734 for sin 98?

    The calculator is in radian mode (RAD): it takes sin 98 as the sine of 98 radians, sin 98 rad ≈ −0.5734. Switch it to degrees (DEG): sin 98° ≈ 0.9903. In radians the value is never undefined: π is irrational, so a whole number of radians never lands exactly on an axis.

    See Also