Try it yourself:
| @1 |
SQRT1_2
|
|
| @2 |
sqrt(1/2)
|
SQRT1_2 is the dimensionless constant 1/√2. It occurs in normalized diagonal directions, 45-degree trigonometry, and equal-amplitude combinations.
Use it to normalize a two-component vector with equal entries. Compare SQRT2 and sqrt; multiplying the two constants gives one.
It is an exact named constant conceptually, though displayed numerically. Use norm to verify vector normalization and pi for exact angular formulas.
Enter SQRT1_2 on a calculator line to see its built-in value, or place the name inside a longer expression. Keep any displayed unit attached when converting or combining physical quantities, and check that every other value uses a compatible dimension.
The example above is editable, so you can replace surrounding values and test the constant in your own formula. Browse all constants to compare related values and notation.