ctgα=-√6, α∈2-ой четв.
1)tgα=1/ctgα, tgα=-1/√6.
2)1+ctg²α=1/sin²α , 1+6=1/sin²α, sin²α=1/7,sinα=1/√7(α∈2чтв.)
3)сos²α=1-sin²α, cos²α=1-1/7=6/7, cosα=-√6/√7⇔cosα=-√42/7.
ctgα=-√6, α∈2-ой четв.
1)tgα=1/ctgα, tgα=-1/√6.
2)1+ctg²α=1/sin²α , 1+6=1/sin²α, sin²α=1/7,sinα=1/√7(α∈2чтв.)
3)сos²α=1-sin²α, cos²α=1-1/7=6/7, cosα=-√6/√7⇔cosα=-√42/7.