Question Number 103887 by bemath last updated on 18/Jul/20
$${how}\:{do}\:{you}\:{prove}\:\mathrm{sin}\:\left({a}+{b}\right)\:=\:\mathrm{sin} \\ $$$${a}\:\mathrm{cos}\:{b}\:+\:\mathrm{cos}\:{a}\:\mathrm{sin}\:{b} \\ $$$${geometrically}\:? \\ $$
Commented by $@y@m last updated on 18/Jul/20
https://medium.com/@nubtrek/easy-with-sin-a-b-proof-vuja-de-50c15fca3344
Commented by bemath last updated on 18/Jul/20
$${blank}\:{image}\:{sir} \\ $$
Commented by $@y@m last updated on 18/Jul/20
$${scroll}\:{up}\:{the}\:{screen}\:{and}\:{check}. \\ $$
Answered by john santu last updated on 18/Jul/20
Commented by bemath last updated on 18/Jul/20
$${thank}\:{you} \\ $$