Mathematics, 11.07.2019 00:30 filthyfish
Show that; sin(x+y)cos(x-y) = sin x cos x + sin y cos y
Answers: 1
from the first and last term, and 
from the two middle terms: you have
, the identity is proven.
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Show that; sin(x+y)cos(x-y) = sin x cos x + sin y cos y...
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