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Mathematics 13 Online
OpenStudy (anonymous):

http://aplus.escholaracademy.net/R85Statics/media/pictures/trigonometry/sum%20difference%20identities/study/page15/981729422359/1366x768/981729422359.png Can someone please explain to me how they get from steps 2 to 3 and 3 to 4 on this identity

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