Identidades trigonométricas básicas
sec α (1+sen²α) =cos α
sec α (1+sen²α) =cos α
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※ Sec α = 1/ cos α
※ Sen^2 α + cos^2 α =1
=> Resolviendo :
Sec α (1+sen^2 α) = cos α
1/cos α (1+ 1-cos^2 α) = cos α
2- cos^2 α = cos^2 α
2= 2 cos^2 α
1= cos^2 α
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