Cos 34 Degrees

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

What is cos 34°?

Answer

cos 34° ≈
0.8290

Angle in radians: 34° = 17π/90. The point of the angle is in quadrant I, where cosine is positive.

≈ — rounded to 4 decimal places. cos 34° can't be written with square roots: 34° is not a multiple of 3°.

P(cos 34°, sin 34°) ≈ (0.8290, 0.5592)

xyOP

P(cos 34°, sin 34°) ≈ (0.8290, 0.5592)

Highlighted: the projection on the x-axis — cosine, x ≈ 0.8290.

All four functions of 34°
FunctionExact valueDecimal
sin 34°—≈ 0.5592
cos 34°—≈ 0.8290
tan 34°—≈ 0.6745
cot 34°—≈ 1.4826

See Also

FAQ

What is cos 34°?

cos 34° ≈ 0.8290

Why does cos 34° 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°. 34° is not, so no such exact form exists; the value is used as a decimal: cos 34° ≈ 0.8290.

Why does a calculator show −0.8486 for cos 34?

The calculator is in radian mode (RAD): it takes cos 34 as the cosine of 34 radians, cos 34 rad ≈ −0.8486. Switch it to degrees (DEG): cos 34° ≈ 0.8290. In radians the value is never undefined: π is irrational, so a whole number of radians never lands exactly on an axis.