20 балов!""
1) sin⁡α= 9/41,sin⁡β= -40/41, 0<α<π/2, 3/2 π<β<2π.Вычислить ctg(α-β)
2) Cвести к тригонометрических функций острого угла:
sin2005°
3) Доказать, что √3- 2sin10°=4 sin25°cos35°
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