Cos 134 Degrees

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

What is cos 134°?

Answer

cos 134° ≈
−0.6947

Angle in radians: 134° = 67π/90. The point of the angle is in quadrant II, where cosine is negative.

≈ — rounded to 4 decimal places. cos 134° can't be written with square roots: 134° is not a multiple of 3°.

cos 134° = cos(180° − 46°) = −cos 46° ≈ −0.6947

P(cos 134°, sin 134°) ≈ (−0.6947, 0.7193)

xyOP

P(cos 134°, sin 134°) ≈ (−0.6947, 0.7193)

Highlighted: the projection on the x-axis — cosine, x ≈ −0.6947.

All four functions of 134°
FunctionExact valueDecimal
sin 134°—≈ 0.7193
cos 134°—≈ −0.6947
tan 134°—≈ −1.0355
cot 134°—≈ −0.9657

Reference angle: cos 46° ≈ 0.6947

See Also

FAQ

What is cos 134°?

cos 134° ≈ −0.6947

Why does cos 134° 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°. 134° is not, so no such exact form exists; the value is used as a decimal: cos 134° ≈ −0.6947.

Why does a calculator show −0.4638 for cos 134?

The calculator is in radian mode (RAD): it takes cos 134 as the cosine of 134 radians, cos 134 rad ≈ −0.4638. Switch it to degrees (DEG): cos 134° ≈ −0.6947. In radians the value is never undefined: π is irrational, so a whole number of radians never lands exactly on an axis.