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Sí es identidad.
(tanx + cotx)senx.cosx = 1 (Como tanx = senx/cosx y
cotx = cosx /senx reemplazas)
(senx + cosx ) ( senx cosx)
------ ------- = 1
cosx senx
(sen²x + cos²x ) (senx.cosx)
--------------------------------------- = 1 Simplificas senx. cosx
senx. cosx
sen²x + cos²x = 1 Por identidad fundamental sen²x + cos²x = 1
1 = 1