Formule simple trigonometrie

Formula fundamentala a trigonometriei - demonstratie



$$sin^{2}B + cos^{2}B = 1$$

$$tgB=\frac{sin B}{cos B}$$

$$ctgB=\frac{cos B}{sin B}$$

$$sin(90^{o} - C) = cos C$$

$$cos(90^{o} - C) = sin C$$

$$tg(90^{o} - C) = ctg C$$

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