Cos 0 Degrees

Sin, Cos, Tan, Cot of an Angle

What is cos 0°?

Answer

cos 0° =

1

Angle in radians: 0° = 0. The point of the angle is on the x-axis: (1, 0).

P(cos 0°, sin 0°) = (1, 0)

P(cos 0°, sin 0°) = (1, 0)

Highlighted: the projection on the x-axis — cosine, x = 1.

All four functions of 0°
Function	Exact value	Decimal
sin 0°	0	0
cos 0°	1	1
tan 0°	0	0
cot 0°	undefined	—

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

Recalculate with different values ↑

Cosine of nearby angles

Angle	cos
0°	1
1°	≈ 0.9998
2°	≈ 0.9994
3°	≈ 0.9986
4°	≈ 0.9976
5°	≈ 0.9962
6°	≈ 0.9945

FAQ

What is cos 0°?

cos 0° = 1

Why is cos 0° equal to 1?

The point of 0° on the unit circle is (1, 0), and cosine is its the x-coordinate, so cos 0° = 1.

What is the sign of cosine in each quadrant?

Cosine is the x-coordinate of the point of the angle: positive in quadrants I and IV, negative in II and III.

See Also