udowodnij tożsamość 1/cos^alfa - 1=tg^alfa
1/(cos²α) - 1 = 1/(cos²α) - cos²α/cos²α = (1-cos²α)/cos²α = sin²α/cos²α = tg²α
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1/(cos²α) - 1 = 1/(cos²α) - cos²α/cos²α = (1-cos²α)/cos²α = sin²α/cos²α = tg²α