Cos 127 Degrees

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

What is cos 127°?

Answer

cos 127° ≈
−0.6018

Angle in radians: 127° = 127π/180. The point of the angle is in quadrant II, where cosine is negative.

≈ — rounded to 4 decimal places. cos 127° can't be written with square roots: 127° is not a multiple of 3°.

cos 127° = cos(180° − 53°) = −cos 53° ≈ −0.6018

P(cos 127°, sin 127°) ≈ (−0.6018, 0.7986)

xyOP

P(cos 127°, sin 127°) ≈ (−0.6018, 0.7986)

Highlighted: the projection on the x-axis — cosine, x ≈ −0.6018.

All four functions of 127°
FunctionExact valueDecimal
sin 127°—≈ 0.7986
cos 127°—≈ −0.6018
tan 127°—≈ −1.3270
cot 127°—≈ −0.7536

Reference angle: cos 53° ≈ 0.6018

See Also

Recalculate with different values ↑

Cosine of nearby angles

Anglecos
120°−1/2
125°≈ −0.5736
126°−√(10 − 2√5)/4
127°≈ −0.6018
130°≈ −0.6428
134°≈ −0.6947
135°−√2/2

FAQ

What is cos 127°?

cos 127° ≈ −0.6018

Why does cos 127° 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°. 127° is not, so no such exact form exists; the value is used as a decimal: cos 127° ≈ −0.6018.

Why does a calculator show 0.2324 for cos 127?

The calculator is in radian mode (RAD): it takes cos 127 as the cosine of 127 radians, cos 127 rad ≈ 0.2324. Switch it to degrees (DEG): cos 127° ≈ −0.6018. In radians the value is never undefined: π is irrational, so a whole number of radians never lands exactly on an axis.

See Also