|
|
- Just a few random, useful things, e.g.,
-
- iff : "if and only if," ⇔.
- wrt : "with respect to."
-
-
| i2
| = - 1
|
| |x + yi|
| = √(x2+y2)
| (note, |z1 z2|
= |z1| |z2|)
|
| ei x
| = cos x + i sin x |
| sinh x |
= 1/2 (ex - e-x) |
= - i sin ix |
| cosh x |
= 1/2 (ex + e-x) |
= cos ix |
-
-
| cos2 x + sin2 x
| = 1
|
| cosh2 x - sinh2 x
| = 1
|
|
|