Cos 98 Degrees
Sin, Cos, Tan, Cot of an Angle
What is cos 98°?
Answer
cos 98° ≈
−0.1392
Angle in radians: 98° = 49π/90. The point of the angle is in quadrant II, where cosine is negative.
≈ — rounded to 4 decimal places. cos 98° can't be written with square roots: 98° is not a multiple of 3°.
cos 98° = cos(180° − 82°) = −cos 82° ≈ −0.1392
P(cos 98°, sin 98°) ≈ (−0.1392, 0.9903)
P(cos 98°, sin 98°) ≈ (−0.1392, 0.9903)
Highlighted: the projection on the x-axis — cosine, x ≈ −0.1392.
See Also
- Arcsin, Arccos, Arctan, Arccot - The angle from the value of its sine, cosine, tangent or cotangent: exact in degrees and π, with the check and the unit circle
- Square Root Calculator - Calculate the square root of any number
- Simplify Square Root Calculator - Write any square root in simplest radical form, step by step
- Geometry Formulas: Area, Volume, Perimeter - The formula for every standard shape, where it comes from, and worked examples
Cosine of nearby angles
FAQ
What is cos 98°?
cos 98° ≈ −0.1392
Why does cos 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: cos 98° ≈ −0.1392.
Why does a calculator show −0.8193 for cos 98?
The calculator is in radian mode (RAD): it takes cos 98 as the cosine of 98 radians, cos 98 rad ≈ −0.8193. Switch it to degrees (DEG): cos 98° ≈ −0.1392. In radians the value is never undefined: π is irrational, so a whole number of radians never lands exactly on an axis.
See Also
- Cos 82 Degrees: Cosine of 82° on the Unit Circle
- Cos 83 Degrees: Cosine of 83° on the Unit Circle
- Cos 84 Degrees: Cosine of 84° on the Unit Circle
- Cos 85 Degrees: Cosine of 85° on the Unit Circle
- Cos 86 Degrees: Cosine of 86° on the Unit Circle
- Cos 87 Degrees: Cosine of 87° on the Unit Circle
- Cos 88 Degrees: Cosine of 88° on the Unit Circle
- Cos 89 Degrees: Cosine of 89° on the Unit Circle
- Cos 90 Degrees: Cosine of 90° on the Unit Circle
- Cos 97 Degrees: Cosine of 97° on the Unit Circle
- Cos 100 Degrees: Cosine of 100° on the Unit Circle
- Cos 101 Degrees: Cosine of 101° on the Unit Circle
- Cos 105 Degrees: Cosine of 105° on the Unit Circle
- Cos 106 Degrees: Cosine of 106° on the Unit Circle
- Cos 108 Degrees: Cosine of 108° on the Unit Circle
- Cos 110 Degrees: Cosine of 110° on the Unit Circle
- Cos 120 Degrees: Cosine of 120° on the Unit Circle
- Cos 125 Degrees: Cosine of 125° on the Unit Circle
- Cos 126 Degrees: Cosine of 126° on the Unit Circle
- Cos 127 Degrees: Cosine of 127° on the Unit Circle
- Косинус 98 градусов (cos 98°) на единичной окружности
- Coseno de 98 grados (cos 98°) en el círculo unitario
- Cosseno de 98 graus (cos 98°) no ciclo trigonométrico