First published at 00:24 UTC on November 12th, 2019.
In this video I go over the trig product identities and provide a simple proof for them. The identities I cover are listed below:
sin(x)cos(y) = 1/2 [sin(x+y) + sin(x-y)]
cos(x)cos(y) = 1/2[cos(x+y) + cos(x-y)]
sin(x)sin(y) = 1/2[cos(x-y) - cos(x+y...