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Формулы сложения
Математический диктант
Question | Answer |
---|---|
sin(α+β) | sinα∙cosβ+sinβ∙cosα |
cos(α-β) | cosα∙cosβ+sinα∙cosβ |
cos(α+β) | cosα∙cosβ-sinα∙cosβ |
sin(α-β) | sinα∙cosβ-cosα∙sinβ |
tg(α+β) | (tgα+tgβ)/(1-tgα∙tgβ) |
сtg(α+β) | (ctgα∙ctgβ-1)/(ctgα+ctgβ) |
tg(α-β) | (tgα-tgβ)/(1+tgα∙tgβ) |
сtg(α-β) | (ctgα∙ctgβ+1)/(ctgβ-ctgα) |
tg2α | (2tgα)/(1-tgα^2) |
sin2α | 2sinα∙cosα |
cos2α | (cosα)^2-(sinα)^2 |
сtg2α | (ctgα^2-1)/(2ctgα) |