Sin 73 Degrees

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

What is sin 73°?

Answer

sin 73° ≈
0.9563

Angle in radians: 73° = 73π/180. The point of the angle is in quadrant I, where sine is positive.

≈ — rounded to 4 decimal places. sin 73° can't be written with square roots: 73° is not a multiple of 3°.

P(cos 73°, sin 73°) ≈ (0.2924, 0.9563)

xyOP

P(cos 73°, sin 73°) ≈ (0.2924, 0.9563)

Highlighted: the projection on the y-axis — sine, y ≈ 0.9563.

All four functions of 73°
FunctionExact valueDecimal
sin 73°—≈ 0.9563
cos 73°—≈ 0.2924
tan 73°—≈ 3.2709
cot 73°—≈ 0.3057

See Also

Recalculate with different values ↑

Sine of nearby angles

Anglesin
70°≈ 0.9397
71°≈ 0.9455
72°√(10 + 2√5)/4
73°≈ 0.9563
74°≈ 0.9613
75°(√6 + √2)/4
76°≈ 0.9703

FAQ

What is sin 73°?

sin 73° ≈ 0.9563

Why does sin 73° 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°. 73° is not, so no such exact form exists; the value is used as a decimal: sin 73° ≈ 0.9563.

Why does a calculator show −0.6768 for sin 73?

The calculator is in radian mode (RAD): it takes sin 73 as the sine of 73 radians, sin 73 rad ≈ −0.6768. Switch it to degrees (DEG): sin 73° ≈ 0.9563. In radians the value is never undefined: π is irrational, so a whole number of radians never lands exactly on an axis.

See Also