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Cscx - Senx = Cosx . Cosx/Senx
Senx . Cscx - Senx² = Cosx²
Senx . Cscx = Cosx² + Senx²
Senx . Cscx = 1
NOTA: Por Identidad
i)
Senx² + Cosx² = Cosx² + Senx² = 1
ii)
Cscx = 1/Senx
Cscx . Senx = Senx . Cscx = 1
Lo que significa que se cumple la igualdad.