Oblicz tg²α jeśli α jest kątem ostrym i sinα=x
sinα=x
sin²α=x²
cos²α=1-sin²α ⇒ cos²α=1-x²
tg²α=sin²α/cos²α= x²/(1-x²)
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sinα=x
sin²α=x²
cos²α=1-sin²α ⇒ cos²α=1-x²
tg²α=sin²α/cos²α= x²/(1-x²)