Formule Trigonometriche Usefull Trigonometric Formulas
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Formule Trigonometriche Usefull Trigonometric Formulas
Usefull Trigonometric Formulas Formule Trigonometriche sin(α + β) = sin(α) cos(β) + cos(α) sin(β) cos(α + β) = cos(α) cos(β) − sin(α) sin(β) tan(α + β) = tan(α) + tan(β) 1 − tan(α) tan(β) cot(α + β) = cot(α) cot(β) − 1 cot(α) + cot(β) sin(α − β) = sin(α) cos(β) − cos(α) sin(β) cos(α − β) = cos(α) cos(β) + sin(α) sin(β) tan(α − β) = tan(α) − tan(β) 1 + tan(α) tan(β) cot(α − β) = cot(α) cot(β) + 1 cot(α) − cot(β) sin(2α) = 2 sin(α) cos(α) cos(2α) = cos2 (α) − sin2 (α) sin(−α) = − sin(α) cos(−α) = cos(α) tan(−α) = − tan(α) cot(−α) = − cot(α) 1 Regole di Riduzione 90◦ ± α π/2 ± α sin + cos(α) cos ∓ sin(α) tan ∓ cot(α) cot ∓ tan(α) 180◦ ± α 270◦ ± α 360◦ − α π ± α 3π/2 ± α 2π − α ∓ sin(α) − cos(α) − sin(α) − sin(α) − cos(α) ± sin(α) + cos(α) + cos(α) ± tan(α) ∓ cot(α) − tan(α) − tan(α) ± cot(α) ∓ tan(α) − cot(α) − cot(α) Valori per angoli particolari ◦ −α −α 0 0 30 π/6 45 60 90 rad π/4 π/3 π/2 √ √ sin 0 1/2 2/2 3/2 1 √ √ cos 1 3/2 2/2 1/2 0 √ √ tan 0 3/3 1 3 ∞ √ √ cot ∞ 3 1 3/3 0 2