SOCORRO!! Se 2x + y = π, então: a) sen 2x + sen y = 0
b) tg y = tg 2x
c) sen (π - y) = 2 senx
d) cos 2x = - cosy
e) cos y = cos²x - sen²x
b) tg y = tg 2x
c) sen (π - y) = 2 senx
d) cos 2x = - cosy
e) cos y = cos²x - sen²x
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