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Mathematics, 24.02.2020 19:53 payshencec21

A. tan(x - 2) = tan x
B. cos(x + y) - cos(x - y) = 2 cosxcosy
C. cos(x+y)+ cos(- y) = 2cos x cosy
D. sin(x + y) + sin(x - y) = 2cosx siny

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A. tan(x - 2) = tan x
B. cos(x + y) - cos(x - y) = 2 cosxcosy
C. cos(x+y)+ cos(- y) = 2c...
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