Преобразование произведения тригонометрических функций в сумму или разность
Переход от произведения к сумме
sinα * cosβ = (sin(α + β) + sin(α - β))
sinα * sinβ = (cos(α - β) - cos(α + β))
cosα * cosβ = (cos(α - β) + cos(α + β))
Переход от суммы к произведению
sinα sinβ = 2sin
cos
cosα - cosβ = -2sin sin
cosα + cosβ = 2coscos
tgαtgβ =
ctgαctgβ =
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sin(30° + x) cos(30° – x) = ?
sin4α · cos2α – sinαcosα = ?
sin75°sin15° = ?
tg20°tg40°tg60°tg80° = ?
Вычислите: sin20°∙sin60°∙ cos50°∙cos10°
Упростите выражение: 12 cos 15° cos105°
Последнее изменение: Воскресенье, 29 Январь 2017, 23:36