[ms660]

So far I have managed the following as an example using symbols by doing the Windows key+semi-colon as demonstrated by Graham and getting them from there:

AC sine wave, find V where Vmax = 100 Volts at a frequency of 50Hz and t = 2.5ms:

V = Vmax sine ωt rad

ωt rad = 2πft rad

∴ ωt rad = 3.1415 × 2 × 50 × 0.0025 × 57.3°

∴ ωt rad = 45°

Sine 45° = 0.707

∴ V = 100 × 0.707

∴ V = 70.7 Volts......hopefully.

EDIT: Note, I enlarged the therefore symbol to size 5 to give it a bit more clarity, here's the original ∴

Lawrence.