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Subject
Тригонометрия
You know skills out of 26 (0%)
Subject:
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Algebra
Наука о том, как работать с углами, и как измерять и вычислять линейные размеры, зная углы
Skills
tg(α − β) = (tg α − tg β) / (1 + tg α ⋅ tg β)
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sin 3α = 3 sinα - 4 sin³α
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cos 3α = 4 cos³α - 3 cosα
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cosα-cosβ = 2 ⋅ cos(α-β)/2 ⋅ cos(α+β)/2
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sinα sinβ= ½[cos(α−β) − cos(α+β)]
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tg 2α = 2 tg α / (1 - tg²α)
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tg(α + β) = (tg α + tg β) / (1 - tg α ⋅ tg β)
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sin(α + β) = sin α cos β + cos α sin β
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cosα cosβ = ½[cos(α−β) + cos(α+β)]
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sin(α - β) = sin α cos β - cos α sin β
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sin2α = 2 sinα cosα
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ctgα + ctgβ = sin(α+β) / (sinα⋅sinβ)
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cos2α = cos²α - sin²α
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ctg α = 1 / tg α
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sinα + sinβ = 2⋅sin(α+β)/2 ⋅cos(α−β)/2
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sinα - sinβ = 2⋅sin(α-β)/2 ⋅cos(α+β)/2
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tg α = sin α / cos α
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cosα+cosβ = 2 ⋅ cos(α+β)/2 ⋅ cos(α−β)/2
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1 / cos²α
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ctg 2α =(ctg²α - 1) / (2 ctg α)
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tgα + tgβ = sin(α+β) / (cosα⋅cosβ)
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sin²α + cos²α = 1
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cos(α - β) = cos α cos β + sin α sin β
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1 + ctg²α = 1/sin²α
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