Cos 179 Degrees
Sin, Cos, Tan, Cot of an Angle
What is cos 179°?
Answer
cos 179° ≈
−0.9998
Angle in radians: 179° = 179π/180. The point of the angle is in quadrant II, where cosine is negative.
≈ — rounded to 4 decimal places. cos 179° can't be written with square roots: 179° is not a multiple of 3°.
cos 179° = cos(180° − 1°) = −cos 1° ≈ −0.9998
P(cos 179°, sin 179°) ≈ (−0.9998, 0.0175)
P(cos 179°, sin 179°) ≈ (−0.9998, 0.0175)
Highlighted: the projection on the x-axis — cosine, x ≈ −0.9998.
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
| Angle | cos |
|---|---|
| 165° | −(√6 + √2)/4 |
| 167° | ≈ −0.9744 |
| 175° | ≈ −0.9962 |
| 179° | ≈ −0.9998 |
| 180° | −1 |
| 195° | −(√6 + √2)/4 |
| 198° | −√(10 + 2√5)/4 |
FAQ
What is cos 179°?
cos 179° ≈ −0.9998
Why does cos 179° 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°. 179° is not, so no such exact form exists; the value is used as a decimal: cos 179° ≈ −0.9998.
Why does a calculator show −0.9975 for cos 179?
The calculator is in radian mode (RAD): it takes cos 179 as the cosine of 179 radians, cos 179 rad ≈ −0.9975. Switch it to degrees (DEG): cos 179° ≈ −0.9998. 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 144 Degrees: Cosine of 144° on the Unit Circle
- Cos 145 Degrees: Cosine of 145° on the Unit Circle
- Cos 150 Degrees: Cosine of 150° on the Unit Circle
- Cos 159 Degrees: Cosine of 159° on the Unit Circle
- Cos 160 Degrees: Cosine of 160° on the Unit Circle
- Cos 162 Degrees: Cosine of 162° on the Unit Circle
- Cos 164 Degrees: Cosine of 164° on the Unit Circle
- Cos 165 Degrees: Cosine of 165° on the Unit Circle
- Cos 167 Degrees: Cosine of 167° on the Unit Circle
- Cos 175 Degrees: Cosine of 175° on the Unit Circle
- Cos 180 Degrees: Cosine of 180° on the Unit Circle
- Cos 195 Degrees: Cosine of 195° on the Unit Circle
- Cos 198 Degrees: Cosine of 198° on the Unit Circle
- Cos 200 Degrees: Cosine of 200° on the Unit Circle
- Cos 210 Degrees: Cosine of 210° on the Unit Circle
- Cos 211 Degrees: Cosine of 211° on the Unit Circle
- Cos 215 Degrees: Cosine of 215° on the Unit Circle
- Cos 216 Degrees: Cosine of 216° on the Unit Circle
- Cos 225 Degrees: Cosine of 225° on the Unit Circle
- Cos 227 Degrees: Cosine of 227° on the Unit Circle
- Косинус 179 градусов (cos 179°) на единичной окружности
- Coseno de 179 grados (cos 179°) en el círculo unitario
- Cosseno de 179 graus (cos 179°) no ciclo trigonométrico