Mathematics, 22.06.2019 09:00 mimi5261

Which of the following are identities? check all that apply. a. cos(x + y) + cos(x - y) = 2009 xcosy o b. cos(x + y) - cos(x - y) = 2 coexcosy c. sin(x + y) + sin(x - y) = 2cosxsiny d. tar(x - 25) = tan x

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Which of the following are identities? check all that apply. a. cos(x + y) + cos(x - y) = 2009 xcos...

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