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Si remplazo el equivalente en
Propiedad distributiva
Cambio de variable
cost=x
multiplico por - ⇔
Factorizando
(x+1)(2x-1)=0
x+1=0 2x-1=0
x= -1 x=
Si
Cost=x cost=x
cost= -1 cost=
t=cos'(-1) t=cos'
t=180°=π t=60°=
Sol.t=,