Trigonometria
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Prove que tg (pi/2 - x) = cotg x?
Trigonometria
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Verified answer
tg (pi/2 - x) = sen(pi/2 -x)/cos(pi/2 -x)
sen(pi/2 -x) = sen(pí/2).cosx - senx.cos(pi/2) = cosx + 0
cos(pi/2 -x) = cos(pi/2).cosx + sen(pi/2)senx = 0 + senx
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tg (pi/2 - x) = sen(pi/2 -x)/cos(pi/2 -x) = cosx/senx = cotgx