Cos 4 Degrees: Cosine of 4° on the Unit Circle

What is cos 4°?

Answer

cos 4° ≈

0.9976

Angle in radians: 4° = π/45. The point of the angle is in quadrant I, where cosine is positive.

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

P(cos 4°, sin 4°) ≈ (0.9976, 0.0698)

Highlighted: the projection on the x-axis — cosine, x ≈ 0.9976.

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